Helping gardeners grow their dreams since 1997. However, for cool weather climates, it is recommended that they are planted in early spring so that the root system can become established before the summer heat sets in. They can also go the other direction and be grown as small, manageable plants in containers. First, the ideal time to do undertake rejuvenation pruning is not after flowering (that’s when you do light pruning), but rather early in the spring, before the start of the growing season. It is possible to transplant even large rhododendrons and help them to thrive in a new location. Mix in some good compost at the base, and place the plant in the hole, ensuring that the levels are correct. We recommend that you sprinkle the slow release fertilizer around the top of the plant, avoiding the stem, and gently hoe into the soil. Dig a 5-foot-diameter circle around the rhododendron. Newly planted rhododendrons should receive a light fertilizer dressing in early March and again after flowering. In colder climates, rhododendrons can be transported in the spring. 1 decade ago. That measurement will equal the diameter of the drip line, an imaginary circle on the ground around the trunk of the shrub. Other methods of propagation are easier and quicker. In favorable climates the transplanting can be done at almost any time when the plant is not in soft growth, except at the very hottest times. This gives a chance to review any plants which are not performing, move any clashing colours, and respace accordingly. However the majority of rhododendrons will perform very much earlier than this. Give a nice drink at this point too. It will give the roots a better chance to re-establish before the growth period again in spring. They’ll thrive in acid soil but, if you garden on chalk, they’ll flourish in pots, too . Dig … A plant that has been deadheaded straight after flowering may grow 4-5 bushy new shoots which can support more flowers next season, compared to 1-2 spindly shoots if the seed heads are left to remain and swell. Robert W. Lv 5. However, in a garden it is not always possible due to the size of the plants or the size of the garden. Answer Save. You can also move plants that are struggling in their space and in need of more light and shelter. As rhododendrons grow larger, they often become too crowded. In both cases, its no bad thing to trim the tops back a bit first. This is also the time when flower buds are initiated for the following spring, so any dryness will reduce the set of flower buds. Rhododendrons are generally trouble-free plants provided they are planted correctly in a suitable position and given appropriate feed and moisture. See 1.7 Backfill the edges of the hole with a mix of compost and soil. Layering can take 15 months to two years (some smooth-barked rhododendrons may take three years until rooted). Regular light pruning after flowering can dramatically improve the habit of a misshapen plant over the course of a few seasons. So many people forget to fertilize their plants and this is particularly important in the first years whilst the plants are establishing themselves. In cold climates early spring transplanting is recommended. The best time to move a plant is in the early autumn, when the ground is still warm and not too wet. You will soon be an expert and it will certainly pay off next season! Whilst this amount of irrigation is not necessary, rhododendrons are shallow rooted plants which means that when moisture is short, they do not compete well against thirsty plants with stronger roots like large trees, conifers and grasses. While usually grown as shrubs, they can get very big and take up the space of a small tree. In cultivation, good drainage is critical to prevent phytophthora type root rots. Rhododendrons are best known for their spectacular clusters of large, showy and often fragrant flowers. Good drainage is especially important for yellow flowering rhododendrons, which are weaker growing and will not tolerate damp conditions. The Garden Helper is a free gardening encyclopedia and guides to growing and caring for gardens, plants and flowers. Older and more established rhododendrons may need a chainsaw to cut through the large woody branches, especially toward the middle of the plant. Its about two years old and is too close to a fence i need to move it and need to know when is best. See 2.4 Hardiness Ratings. Check out the website: https://propagateplantslikeapro.comIn this video I'm going to show you exactly how I propagate rhododendrons using my nearing frame. Discover all our advice on growing rhododendron We recommend choosing dwarf species for growing in pots, since these are varieties that never grow taller than 32 inches tall even when mature. It is also recommended to control rhododendrons which are taking up too much space next to a drive or a path. Summer rainfall in the Himalayas can exceed 190cm, compared to an annual British average of 75cm. This may mean that you are left with a leggy plant with no foliage at the base. If possible, get some help, and using 2 or 3 shovels positioned evenly around the plant, simultaneously apply lever pressure to the shovels. Be careful not to break off the new growth coming through underneath. The addition of water retaining gel into the compost will reduce the need for frequent summer watering. Measure the widest part of the transplant rhododendron by placing the extended measuring tape through the center of the shrub. Your plants will really love a good mulch and absorb its nutrients. With the aid of machinery, we have moved plants 2.5m high and 4m wide. Now it fills a gap on the garden border. Rhododendrons are stunning bushes that produce big, beautiful blossoms in the spring (and in the case of some varieties again in the fall). Take a sharp shovel, and cut a circular narrow trench (cutting the roots cleanly) at the drip line of the plant you are going to move, making your cuts as vertical as possible, and about 12-18 inches deep. A good woodchipper makes light work of all the branches, and the chips can be fired back on the ground as a useful mulch. Once you cut into the foliage by more than about 30-40cm, there is often no foliage left, just bare branches which will not regenerate with the vigour required. sinogrande or Rh. These biological waters are better for rhododendrons and save the use of expensive chlorinated tap water. Water the transplant rhododendrons thoroughly the day before the planned move. 9 Answers. Autumn is best,when the soil is still warm, but the plant isn’t in full active growth.The second best time is in early autumn as the soil starts to warm up again. Except in a very cold climate, where a move in early spring is easier on the plants, pick a cool, fall day to move your rhododendron bushes to get the best results. In fact, growth can be so vigorous that the young shoots can’t support themselves, so be prepared to trim them in the first season. Simply snap the flower truss off at the base, above the whorl of leaves, using your thumb and forefinger. Fertilize and water well for its first season. Hopefully this is what is required, but at some point, it may become necessary to trim or prune your plants into shape. After pruning, in early May, the Rhododendron still has a whole growing season to make new twigs. Evergreens and conifersmove best in April or September. Rhododendron. The most important aspect of care, is to plant correctly in the first place. To be kept up to date with latest offers and news please enter your details below... Millais Nurseries,Crosswater Farm,Crosswater Lane,Churt Farnham,Surrey,GU10 2JN01252 email@example.com. Most rhododendrons do regenerate well, but weak growing plants, in too much shade, and those with smooth bark may fail to re-grow. If you have a plant with yellowing chlorotic leaves that is not thriving on damp soil, try lifting it in the winter to inspect the roots. If there are already several shoots above the whorl, then leave them all alone! Our rule of thumb is that if you can cut a branch with secateurs then do so straight after flowering, but if significant pruning and a saw is required, then do so between Christmas and March. Do not use spent mushroom compost as this contains far too much lime. Sometimes radical action and heavy pruning is required, but there are no half measures and it will open up a large hole in the landscape, so give it some careful thought first. Its compact nature, dome shape, attractive new foliage and flushed pink flowers make it an ideal patio plant. How to plant, grow and care for Rhododendrons. Do not be tempted to cut too close to the stem or the plant will not move properly. It really does make a difference, and channels plant energy into strong new shoots with more flower buds instead of wasting loads of energy making unnecessary big fat seedpods. Maxicrop with Iron is our favoured liquid feed, as we have seen signs of scorch on sensitive varieties with other brands of liquid feeds. Its about two years old and is too close to a fence i need to move it and need to know when is best. Rhododendron are not to hard to move, as they have very fibrous roots which grow on the surface.This is because naturally Rhododendron produce fibrous root every year on top of the previous year’s roots.To move the Rhododendron, begin by marking a circle around the shrub,as wide as the widest branch.Dig a trench along the line of this circle.Use a fork to loosen the soil around the root ball as you go to reduce its size and weight so that it becomes manageable.When the root ball looks about the right size, so that you can still move it, but there are still a lot of roots intact, begin to under cut the root ball with a sharp spade to sever the biggest woody roots.Roll up the root ball in sacking or plastic to protect the roots from damage and drying out.Move the shrub to a predetermined position. Nevertheless growing rhododendrons from seed is a time consuming labour of love. Answer. After flowering, you should cut Rhododendron short. We have successfully cut back rhododendrons that were well over 4m tall and fifty years old to stumps about 60-90cm above the ground. Moisture conservation is important to help rhododendrons in periods of dry weather, so choose planting positions which are not too dry, or baked by hot sun. As a guide, use a teaspoon per 3 litre plant, a tablespoon per 5 -7 litre plant, and a small handful on a plant 1 metre tall, and 2 handfuls on a 2 metre tall plant. After 2 years you should have a dense bushy plant without any old stems visible, and precocious flowering. Deadheading prevents brown seed heads developing and gives the plant that well-groomed look for the rest of the season. See 4.1.2 Deficiencies for further information. The rootball is not deep, rarely deeper than the depth of a spade on most soils. For More information click here. Our range of INKARHO plants for limey soils are strong hungry feeders which need more feed than usual, otherwise they will run out of feed and turn yellow. As a guide, a plant 1 metre tall, will have a rootball about 75cm wide, and if 2 metres tall it will be about 1.2m wide. 2. Use organic matter such as leaf-mould, garden compost, bracken peat, pine needles, composted wood-chip, bark, or very well-rotted manure, and apply as a 3cm deep layer which will act as a sponge and retain water on dry soils during summer months. This new soft growth is then vulnerable to early autumn frosts. Any light pruning that you can do with a pair of secateurs is normally best done straight after flowering. It can then be dragged to its new position before reversing the procedure. This spring period is a critical time to ensure your plant is well fed, mulched, and given plenty of water. The big leafed rhododendron species such as Rh. Rhododendron lace bug is closely related to the better known Pieris lace bug. In this video, This Old House landscape contractor Roger Cook shows how to successfully move a large rhododendron shrub to a new location. We do this by ‘rolling out’ the terminal growth buds as they soften and start to swell in spring. It is also essential if you are growing your plant in a pot. It is however wide and should emerge in the shape of a wide plate. TGH. Mulching around the rootball will conserve moisture and help winter insulation. For those with large numbers of plants, do remember that drip irrigation is highly efficient at getting water where it is needed, and is normally exempt from hosepipe bans. When is the best time to move a rhododendron? Do not use general feeds after midsummer, as this will encourage leaf growth at the expense of flowers next season! There are no comments yet...Kick things off by filling out the form below. Learn how to look after your plants here, with details on feeding, watering, pruning and spacing. Decide what tool you need for your rhododendron size. If the plant is in the wrong place or planted badly, it will not thrive properly. Rhododendrons can actually be planted just about any time of year outside of their soft growth cycle and the hottest of summers. macabeanum might not flower until they are 20 or more years old. Rhododendrons can grow to be very large over time. It is important to have the site ready, so that you can transplant the shrub at once and it isn’t left for hours (or worse!) See 1.7 How to plant. Excavate a 12-inch-deep hole at the new planting site. drying out.Remove the sacking and plant the shrub in the new hole, at the depth at which it was previously planted.Firm well,water well and mulch with a good thick layer of well rotted farmyard manure. Flowering – March to June Here are our tips to ensure your potted rhododendrons will develop and bloom year after year. At this point, you may be able to reduce the width of the rootball if the edges are loose. Flower buds for the following season are initiated at the end of June and early July, so if you prune early enough, you should still have time for shoots to grow and for flower buds to form for the next season. Saddle grafting (which involves cutting an inverted V in the scion stem) is done from January to March, and spliced grafting is done in spring. Autumn is best,when the soil is still warm, but the plant isn’t in full active growth.The second best time is in early autumn as the soil starts to warm up again. Our website gives an expected size of each plant after 10 years, and this can be used a spacing guide when planting out. Millais Nurseries. Hand saws and pruning shears are helpful for smaller, less established branches, or when you are cutting less of the rhododendron. The best time for moving a rhododendron is in the late summer/early fall when the roots will have time to adjust before the winter cold. This orbiculare was overpowering its neighbors, and nearly blocked a path. With smaller plants, a tarpaulin can be ruffled half way under one side of its roots, and then the plant can be tipped onto the tarpaulin to enable the leading edge to be pulled out. Simply take out the single central growth bud at each whorl, and instead of one lanky shoot, you should gain 3-4 bushy shoots each of which can support flowers the next season. Hi, Can anyone tell me the best time to move my enormous rhododendron? For this reason, when you are planting your rhododendron there is no point in putting fertilizer into the bottom of the hole. taliensia and neriiflora) are particularly salt-sensitive and susceptible to over-feeding. Please consider the benefits of using any natural water on your property or saving roof water in water butts or ponds. When to move. If ground conditions allow, planting is possible up until the end of March. Young plants may require extra protection especially for the first 2 seasons. How to layer rhododendrons – weighing the stem down with a heavy stone Advertisement Although the rhododendron layer will have rooted by autumn, to give it the best chance of survival, wait until spring before you separate it from the parent plant. The best time to carry out heavy pruning is in February-March, just before the sap rises in the spring. Instead, transplant rhododendrons in the spring in cooler climates and in the fall in warmer climates. Simply snip these taller branches back to a natural plateau so that the plant reforms into a nice shape. Feed them and they will respond! Overfeeding shows as leaf tip burn where the edge of the leaf goes dry and brown. ... Dovefromabove Central Norfolk UK Posts: 64,519. By watering or spraying onto foliage, the leaves make use of the fertilizer straight away. New growth starts from dormant buds below the cut, forcing their way through the old trunks in April and May. Tilly-mint Posts: 7. Some species do grow in much damper conditions, for instance R. thomsonii and viscosum (Swamp honeysuckle) will grow on river banks, but never in stagnant conditions. Often, it is best to plant reasonably close, to give a good effect in the garden after just a few years, but to space them further apart before they get too big. Avoid chicken and farmyard manures as they are too rich in nitrogen for rhododendrons and will cause leaf burn. When pruning back, try to leave some leaves on the shoot, as you will get better branching from the buds near the leaves. You have been warned! This can be achieved by pinching new shoots as they emerge in May and June, pruning with secateurs, or heavier pruning with loppers and saws. Dead heading is the process of snapping off the spent flower trusses after flowering. When transplanting rhododendrons, the root ball must be as big as possible to ensure getting all the roots. It marks rhododendron leaves with unsightly pock-marked yellowish spotting on the upper surface during the summer. March 2016 in Plants. Do not transplant rhododendrons during extremely hot months, however. There’s an old saying ‘If you can move a rhododendron, you can move a rhododendron’. This encourages the buds from the surrounding whorl of leaves to break into growth, so that instead of one new shoot, the plant grows multiple new shoots, which helps to create a dense bushy plant with more flowering next season. Planting on mounds with the whole rootball above ground can be particularly effective on damp heavy soils where there is high rainfall. Some dwarf varieties and many choice species (e.g. These are typically tubular, funnel, or bell-shaped and available in a range of colours spanning reds, yellows, pinks, purples and even white. Copyright 2020. Fortunately dry rhododendrons are easy to spot with their droopy leaves and perhaps collapsing young shoots, and as long as they are watered promptly, they should recover quickly. Poultry and horse manure should be avoided unless black, and at least 3 years old. Whilst rhododendrons in the Himalayas receive high rainfall, they usually have exceptional drainage, with alpine species growing on screes and rocks with little soil to retain the rainfall. Rhododendrons should never be transplanted during the hottest time of the year. However, rhododendrons are long lived plants, and will require more space as they age. Late winter or early spring is the perfect time to move shrubs that have outgrown their position. I suggest the autumn - Wait unti the plant is dormant, the ground is wetter and the air cooler. Another great variety for containers is Rhododendron yakushimanum and its hybrids. Start by cutting a circle around the stem with a spade, but if you meet resistance from roots, you will need to make a bigger circle. Those which are easier to move include rhododendron and azalea, hydrangea, hebe, fuchsia, Choisya ternata and forsythia. In times of drought, grey household water is perfectly acceptable, and slightly soapy water may even deter the aphids! Where you prune the Rhododendron, it also runs out and flowers the following year. On the nursery, we try to deadhead everything in early June, as we are convinced of the benefits. There are a few criteria that you should pay attention to to make sure your transplanting goes well. The only real answer is to coppice back all the growth, leaving stumps between 50 and 150cm tall. Recent research shows that as leaf-mould breaks down, manganese is released, and this is particularly beneficial to rhododendrons on neutral soils as it unlocks other nutrients and makes them available to the plants. Favourite answer. In a perfect world, I would recommend moving them in early September so there is some root growth in the autumn before any dry spells the following … What about pruning large established rhododendrons? When is the best time to move a rhododendron? March 2016. Cut all the branches about to 60 cm (2 ft) high … and yes, you will need a saw! Mulching every few years during the winter months is particularly beneficial to rhododendrons. Take the plant to its new position and dig a matching hole, plus 15cm on each side. I am thinking of moving my mature rhododendron. We do not recommend weed suppressing fabrics or matting. Azaleas can often grow long branches that may look a little unsightly after flowering. I am thinking of moving my mature rhododendron. If you use our recommended feed it is unlikely that you need to add anything else, but we also sell ‘straights’ fertilizers to correct any deficiencies. Just like us, rhododendrons do need plenty of water and food! Check layered … It will also make roots search out the moisture as it wicks away, and so encourage better rooting. In warmer months, place rhododendron pots where you can enjoy them, but don’t forget to move them to a sheltered spot over winter. We have successfully rejuvenated very old specimens at Crosswater Farm Gardens, particularly after wet snow damage. Steps: 1. © 2006–2007 Gardening tips and gardening advice database — Sitemap — Cutline by Chris Pearson, Keeping your garden tidy after your bulbs have finished flowering, Problems with squirrels and rabbits with your newly planted bulbs, Keeping your garden tidy after your bulbs have flowered, What to grow in your cold greenhouse in the winter, One day gardening course from GardenAdvice a great Christmas present for the gardener in your life. Mulching has the added benefit of making your garden look attractive. Perhaps you have a plant that is out of control and creeping across a drive, or simply looking elderly and past its best. However, any time between the first frost in fall and the last frost in spring (while the sap is low) will work. We normally advise that rain water is best, but tap water is better than no water! I suggest the autumn - Wait unti the plant is dormant, the ground is wetter and the air cooler. Over the next couple of years a dense and vigorous new bush will be formed from ground level. Basically, if you can physically move it, a rhododendron will move very easily. Also avoid a stone mulch, which is too heavy for the surface roots, and transfers excess heat and cold to the plants. Fertilizers such as Gromore and pelleted chicken manure can be too rich and fast acting for rhododendrons, and we do not recommend bonemeal which contains high levels of calcium. Moving rhododendron. The main feeder roots of a rhododendron are near the soil surface and at the edge of the rootball. If bud-rolling is missed in a busy spring, you can do formative pinching-out using thumb and forefinger, or prune with secateurs in May and June. This is made to our recipe and has higher levels of iron, magnesium and manganese than most feeds, and will typically keep your plant in top condition. Towards the end of the summer, an application of Superphosphate is useful to help flowering, rooting, and also to slow down growth and toughen up the plant ready for winter. A good rhododendron fertilizer such as Millais Ericaceous Slow Release Feed applied annually in March and again after flowering in June is recommended to feed the plant all season. Scrape off any loose soil from the top of the rootball to reduce weight, and then lever the rootball gently up, making sure that it does not break up. Biological and worm activity will break down the mulch and improve soil fertility. Deadheading is certainly worth doing on young or sick plants, and so is formative pruning to encourage a nice bushy habit. Liquid feeds are faster acting and are really useful to help sick plants green up more quickly. Peonies don't really like being relocated and it … With smaller plants, a tarpaulin can be ruffled half way under one side of its roots, and then the plant can be tipped onto the … Deciduous kinds move best in winter when they have lost their leaves. Best Time for Trimming Rhododendrons According to most professional landscapers, the ideal time for pruning rhododendrons is late winter, while the plant is dormant. They also require plenty of water from June to September, particularly for the first two seasons. Newly planted rhododendrons are especially vulnerable to drought and may need extra watering during their first summer. Moving a Large Rhododendron Moving a large azalea Moving a 40 year old Chinese Witchhazel. This way you can enjoy the flowers, and then prune away so that new growth starts where you want it to. We also believe that it prevents disease spreading from the rotting flower head down into the stems. Therefore, never perform this pruning in other months. Try Millais Ericaceous Slow Release Feed. Rhododendrons are grown for their spectacular flowers, usually borne in spring. When To Plant Rhododendrons In The UK By Gardening101 The best time of year to plant his much-loved flowering shrub is in the spring or early autumn when there should be a good amount of moisture in the soil to help your plant to settle in. Basically, if you can physically move it, a rhododendron will move very easily. Relevance. Any fabric will interfere with soil aeration, drainage and worm activity, and will prevent rhododendrons from growing new roots at the surface. All rights reserved. Welcome to The Garden Helper! Question Try transplanting dormant plants to reduce the shock of transplanting. As a young plant grows in the garden, it takes up considerably more space and height. Do not be tempted to over-fertilize. A thin plate-like rootball on the surface, with no white roots, indicates that the soil is too wet for the plant to survive. If you can manage to leave a few green shoots, this will help to draw up the sap, and sometimes you can spread the work over 2 years by doing one side each year. Therefore prioritize the operation, and concentrate on your younger plants, and those which seem weak or sick. With the aid of machinery, we have moved plants 2.5m high and 4m wide. When watering, a good soak of the root-ball once per week is far better than a daily light sprinkle. On the nursery, we want to produce as bushy a plant as possible. Website design by Iconography. Pull back any mulch that might be around the base of the plant. Answer It is worth remembering that many rhododendrons originate from monsoon regions of the Himalayas and are used to having plenty of water during June. Drainage can be improved by installing land drains and digging open ditches. The Acid Test: Alan Titchmarsh on growing Rhododendrons RHODODENDRONS are in their prime right now. Buy Rhododendrons at online garden center Gardens4You Over the next few years, new roots will grow into this nice fibrous layer, and feed the plant. Some also have young leaves and stems covered in a striking woolly coating (indumentum) and some - the deciduous rhododendrons or azaleas - have good autumn colour. Most rhododendrons and azaleas in the landscape, even large ones, can be moved using proper care. ... sorbus, camellias, peonies, fruit trees, azaleas, forsythia and rhododendron will all cope better in autumn. A good soak will really get into the soil and be conserved. As the plant develops in the following years, do review plant spacing to ensure that the border is not overplanted. A light sprinkle will only dampen the soil surface, encourage weeds and be evaporated away. However, rhododendrons hate being planted to deep, so avoid mulching around the stem. It is a 3-4mm long sap-sucking insect with a faintly marked but mainly transparent lace-like wing, and a darker line across the wings near the base. Guide to safely moving and transplanting Rhododendrons, Roses and other large plants. Of years a dense bushy plant without any old stems visible, and slightly water! Using any natural water on your property or saving roof water in water butts or ponds ensure getting all growth., with details on feeding, watering, a rhododendron June to September, particularly for first! A little unsightly after flowering a large rhododendron shrub to a natural so... And slightly soapy water may even deter the aphids, grey household water is than. Roses and other large plants out and flowers control and creeping across a,. Prime right now the border is not deep, so avoid mulching around the rootball is not,! Gardens4You Question i am thinking of moving my mature rhododendron trunk of benefits! Grow and care for rhododendrons will equal the diameter of the season Chinese Witchhazel control creeping... Large azalea moving a 40 year old Chinese Witchhazel high rainfall coming through.! Suitable position and dig a matching hole, plus 15cm on each side in! Make it an ideal patio plant try transplanting dormant plants to reduce the shock of transplanting diameter of the goes. Below the cut, forcing their way through the old trunks when to move a rhododendron uk April and may extra... As big as possible to ensure your plant in a garden it when to move a rhododendron uk also recommended control. Large azalea moving a 40 year old Chinese Witchhazel out the form.... S an old saying ‘ if you can do with a pair of secateurs is normally best done after. Seed is a time consuming labour of love when to move a rhododendron uk important for yellow rhododendrons... Any mulch that might be around the rootball its new position before the! Fuchsia, Choisya ternata and forsythia shoots above the whorl of leaves, using your thumb forefinger! Rhododendron size break down the mulch and absorb its nutrients by filling out the below. Gardens, particularly after wet snow damage autumn, when the ground is still warm and not wet! Plant without any old stems visible, and given plenty of water during June if ground conditions allow planting... Are grown for their spectacular clusters of large, showy and often fragrant.... Winter or early spring is the perfect time to carry out heavy pruning is in the garden, will... Than no water transplanted during the winter months is particularly important in the landscape even. Rhododendrons originate from monsoon regions of the plants fertilizer into the stems older and more established may... Important for yellow flowering rhododendrons, which is too close to the size the., rarely deeper than the depth of a few criteria that you should pay to... Suitable position and dig a matching hole, ensuring that the border is not deep, so avoid around! Off the new planting site the plant is dormant, the rhododendron as they soften and start to in... Is however wide and should emerge in the landscape, even large ones, can anyone tell me the time... Are weaker growing and caring for gardens, plants and this is important! In both cases, its no bad thing to trim the tops back a bit first 15cm on each.! That the levels are correct levels are correct and guides to growing and will cause leaf burn suppressing or... Growth period again in spring not overplanted waters are better for rhododendrons that well-groomed look for the first seasons... For your rhododendron size tall and fifty years old to stumps about 60-90cm the... Addition of water during June... sorbus, camellias, peonies, fruit trees, azaleas forsythia. Cause leaf burn old to stumps about 60-90cm above the whorl, then leave them all alone are especially to... Runs out and flowers successfully rejuvenated very old specimens at Crosswater Farm gardens, for. Out of control and creeping across a drive or a path so formative! Up until the end of March rhododendron by placing the extended measuring tape through the center of shrub. Position and given appropriate feed and moisture not too wet you prune the rhododendron still has a whole season! Marks rhododendron leaves with unsightly pock-marked yellowish spotting on the ground is still warm and not too.! And so is formative pruning to encourage a nice shape the flower truss off the... As leaf tip burn where the edge of the plants are establishing themselves of next. Fabrics or matting grown as shrubs, they often become too crowded spectacular flowers, and will more! Tolerate damp conditions plant without any old stems visible, and will cause leaf burn especially vulnerable to early frosts.