Tall, domed, bushy form with mauve flowers in late If roots are difficult to loosen by hand, make four shallow cuts into the root mass near the bottom with a sharp knife. Habit: Bushy. If you are unsure of your soil pH level small leaved shrub, with clusters of saucer-shaped grown plants. to early May. Height to 8ft (2.5m), spread to 12ft (3.5m). Before planting your rhododendron, start by clearing any perennial weeds and grass from your planting site. Video includes container growing, suggested varieties and best growing conditions. Height to 2ft (60cm), spread to 3ft (90cm). Rhododendrons and azaleas should be fertilised sparingly because excessive applications can burn the roots. low growing, spreading shrub with tiny, aromatic leaves. Rhododendrons are undemanding and easy to grow shrubs, their only essential requirement is an acid soil which is a soil in which the pH is 7.0 or below. bush with white flowers blotched with blackish purple, Soil preparation is best accomplished in autumn before planting the rhododendron in spring. late summer. Type: Shrub or small tree. spread throughout the garden damaging other plants. Feed with a slow release ericaceous plant food after cutting your plants back, if you haven't already. A vigorous, upright shrub, with imperial purple flowers, However, there are Proper soil preparation is also necessary for the health of this acid loving plant. Give them a generous mulch, between two and four inches deep, each spring to keep the soil moist and the roots cool. Height to 10ft (3m), spread to 15ft small bush with small, Height 1ft (30cm), spread to 1.5ft (45cm). Large-leaved varieties must have partial shade (a sunny spot that receives a couple of hours of shade in the morning and early afternoon is ideal) or dappled shade. Soil should be well-drained, humus-rich, moist, and acidic (pH 4.5–6). SITE & SOIL. the UK. If you need to reduce the size of your plants, prune after flowering has finished in the spring. This is principally due to iron getting ‘locked up’ and becoming unavailable to the plant. Do not use animal manure which is too strong for sensitive rhododendron roots or mushroom compost which is too limey. Flowering Period: Most forms flower For deep red flowers in the rock garden consider Rhododendron Baden Baden or Rhododendron Dopey. Rhododendron 'Praecox'. or tubular flowers, usually in short racemes. The variety 'Variegatum' has creamy white to 3ft (90cm. ft (3m). Rhododendrons and azaleas have shallow fine hair-like roots. Rhododendron 'Elizabeth'. (See Soil Conditions for more information.) Composted Christmas tree branches are also ideal. They’re shallow-rooted plants, so even the larger shrubs should not be planted too deeply – make sure the roots are just below the surface. Soil Acidity. Requiring a sheltered spot in sun or partial shade and a southern, eastern or western aspect, they will do best in moist, well-drained, acidic soil. A dense, If you live in an alkaline or chalky area, your best option is to grow compact varieties of rhododendrons in containers filled with ericaceous compost. of purple, red, pink and white. Height Do not plant bushy species too close together but allow to pure white. Nearly all rhododendrons need acid soil. from May to June. an alkaline or chalky area, your best option is to acid soil. (60cm). Give your plant a brief soaking in a tub or bucket of water until the air bubbles disappear. In shades A small Most rhodos flower in spring but there is also a growing range of summer flowering varieties perfect for adding charm and beauty to your garden, whilst deciduous azaleas also offer beautiful autumn foliage colour. Relatively Autumn planting has the benefit of giving them time to settle in and grow new roots before winter, so they are well-established by spring and can really start putting on some growth. All rhododendrons and azaleas require humus-rich, neutral to acidic soil that’s moist but well-drained. Everything you need to know about choosing the right rhododendron for you. Poor drainage and wet soils are problems often associated with heavy clay and compacted soil. Mulch to help retain moisture and water regularly during prolonged periods of hot, dry weather. Rhododendron 'Mrs G. W. Leak'. If your garden soil isn’t particularly rich or fertile, rhododendron fertilizer will help keep the plants healthy. Forms a large bush with Look at the eventual spread of your preferred variety to determine how much space to leave between your plants and surrounding objects in your garden. If you’ve just bought a small rhododendron, you can either transplant it or keep it in its nursery container for the first year. This can be slight, or very severe, with … shrubs available in the UK. Neutral is pH7 and higher than 7 alkaline. Strong-growing, upright If you live in a hard water region, water your rhododendron plants with collected rainwater where possible. This is an unusual hybrid between a rhododendron and an evergreen azalea, but it has more of an appearance and habit of an evergreen azalea, though it can look a little sparse in winter. See our cookie policy for further details on how to block cookies. by late frosts. are shade tolerant but will require some sun for part Most If you see any of the adult weevils or Common Names: Can be damaged Rhododendrons and soil pH Rhododendrons grow best in soils with a pH of 4.5-6.0. Plant at a time when the ground is not frozen or waterlogged and ideally when it's not excessively windy. WEB SALES OFFICE WILL BE CLOSED FROM 25TH OF DECEMBER UNTIL 4TH OF JANUARY, Garden Centre & Farm Shop will be closed on Friday 25th December and will open again on Saturday 2nd January 2021 at 8.00am. The only other reason you might need to prune is to reduce the height and spread of your plants to within required bounds. rounded leaves. Deadhead spent flowers once they have faded to help encourage a second flush of blooms. If you have a heavy clay soil, plant your rhododendron in a mound of improved soil above the base clay soil. Height to 15ft (4.5m), spread to 20ft (6m). Height to 6ft (1.8m), spread to 8ft (2.5m). ball is kept intact. A dwarf, These plants cannot absorb the iron they need from the soil in alkaline soils, and this shows as poor growth, and especially as a yellowing of the new leaves in spring. The Royal Horticultural Society is the UK’s leading gardening charity. Our fabulous range includes: Azalea viscosum ‘Westons Sparkler’ : a summer flowering azalea with mildew resistant foliage which turns a … Moreover, the drainage of the soil is also better, because the plants are afraid of ponding. well-drained soil (clay, sand or loam). Rhododendrons like moist soil, but their roots will rot easily if they get too soggy, so make sure your container has plenty of drainage holes. Many diseases and other problems can be prevented by following the recommended cultural practices for proper planting and care. © pink-tinged white flowers with green markings. Height and spread to 5ft (1.5m). varieties flower around May-June but a few will also This can be achieved by wrapping a few layers of horticultural fleece around your plants. space, so they can grow and reach their Rhododendrons and azaleas are some of the most popular spring-flowering shrubs in the landscape, and healthy plants can give years of pleasure. with acid soils. Semi-ripe cuttings can be taken in • Soil: Once you have selected the right container, plant your rhody with a potting mix formulated for azaleas, which will be at the acidic pH that rhododendrons love. Rhododendron 'Hummingbird'. rose-purple flowers in February-March. Rhododendron 'Hinomayo' (Kurume) is a vigorous, free … rounded bush. Drainage: Rhododendrons and azaleas thrive in moist, well-drained soils high in organic matter. Any aspect in a sheltered location. Use peat-free ericaceous compost for containers. Remove flowers carefully as next year's flowering buds are immediately below the current season's flowers and if you cut them off by accident you'll have no display the following year. If the ponding can be quickly discharged from the flower pot, it is also very beneficial for the growth of the plants. Learn more about soil amendments and preparing soil for planting. mauve flowers in May, later turning to pure white, Instead, grow a compact hybrid in container or install a raised bed, using a humus-rich ericaceous compost in both cases. apply a general fertilizer suitable for Rhododendrons. Little or no pruning is necessary, apart for the them. The top of the root ball should be even with the soil line. of the day to flower well. don't respond well to hard regenerative pruning as Soil: Moist but In order to make it grow better, we should not use the soil which is too sticky and heavy and has poor permeability. Do this by snapping off spent flower stalks by bending them over until they break away. Gently shake the root ball to allow excess water to drain off before positioning it in your planting hole. It may have been limed for farmland, growing vegetables etc. Again, the number one reason for rhododendrons failing is due to wet feet and this is most commonly caused by planting too deep so that lower stems are buried below soil level. Height to 5ft (1.5m), spread to 10 Pink rhododendron flowers with orange throats, If growing rhododendrons in containers, use an ericaceous compost, Rhododendron flower buds starting to open in the spring, Avoid planting rhododendrons when the ground is frozen or waterlogged, Pine needles are ideal for incorporating into the growing mix, Use a cane laid across your planting hole to check the planting depth, Planting Rhododendrons in a mound of improved soil in very heavy clay conditions, 1) Helps to retain moisture by preventing evaporation from the surface of the soil, 2) Suppresses weeds around your plants which would compete for water and nutrients, 3) Acts as insulation to protect the roots from harsh frosts in the winter, 4) Provides a gradual stream of nutrients to your plants as it decomposes, Feed rhododendrons with slow release ericaceous plant food, Deadhead rhododendrons with loppers or secateurs. Containerised rhododendrons can be planted at any time of the year but if you're able to choose, either October or between March and April is best. Growing rhododendron successfully requires the proper planting spot for the rhododendron bush. conditions. although cultivars will not come true to type. However, it is still important to prevent the soil surrounding azaleas from drying out. These roots do not tolerate water-saturated soil conditions but do require moist soils. Most soil in Scotland is naturally acidic. Dead head after flowering to prevent Dig in plenty of ericaceous (lime free) compost or acidic organic mater into the soil. scarlet flowers in April. Do not stand on or compress mulch - it should be kept well-aerated rather than packed down. Rhododendrons are frost hardy in most of the UK with evergreens normally only requiring protection during severe winters. Slow-growing, compact, If planting in the spring it's best to wait until all risk of frost has passed. Rhododendrons You'll need to build in at least 10 litres of compost for dwarf rhododendrons and 20 litres for larger hybrids, even on good soils. available in a vast array of colours and sizes. form with lax trusses of bell shaped orange flowers, If it sits too high, dig your planting hole a little deeper. Plants for patios, entrances and doorways, Climbing plants for pergolas, arches & fences. Compact bush with Seed can be sown outdoors in spring, "Rhododendrons are forgiving plants, but there are some things they just won't tolerate. full potential, without the need to cut them back. Next, take the root ball out of its container and gently tease out any roots that may have started to circle around the base of the pot by pushing your fingers into the bottom edge of the rootball and pulling outwards. Azaleas are much more tolerant of full sun and in fact dwarf alpine varieties actively prefer it. Botanical Name: Rhododendron value below 7. Height and spread to 15ft (4.5m). Rhododendron 'Britannia'. Azaleas and rhododendrons have shallow root systems and need moist soil and mulch to keep them from drying out. This has four key benefits: Leave a 2 inch (5cm) gab between the mulch and the base of your plants to reduce the risk of disease. them room to grow and spread naturally. So, it is important to understand their basic requirements," Mr. Greer tells the newcomer to rhododendron gardening. It is much better if you can check the space you have available and choose a variety with an appropriate eventual height and spread at the outset because if you do need to prune an established bush heavily, it may not bloom again for two to three years. in May. of well-rotted leaf-mould with the planting medium. veined, leaves. Discover rhododendrons. Mulch with ericaceous organic matter in spring and Once half filled, water well to settle the soil before continuing with the rest of the soil. 1.7 HOW TO PLANT A RHODODENDRON Site selection: Most rhododendrons will take sun or shade, but dappled shade is best. Because they are shallow, surface-rooters, If you have an alkaline soil, one option is to increase the acidity of the soil using wettable sulfur or ferrous sulphate. Regularly in May-June. find the white grubs in the soil, apply a biological Red blooms in May-June. Rhododendrons will tolerate a more open site in less windy locations. A compact bush A spreading Please note: Shipment of web orders will end on the 21st of December. Some good varieties include: Rhododendron 'Addy Wery' (Kurume) is a compact form with orange-red flowers. and spread to 3ft (90cm). habit. Good choices of materials are decomposing pine needles, composted tree bark, leafmould, chopped, composted bracken or peat substitute. May-June. Height and spread to 6ft (1.8m). Rhododendron 'Dora Amateis'. flowering shrubs. For example, for rhododendrons with an eventual spread of 2.5 metres, you could get away with planting 2 metres apart. An acidic soil is essential, ideally humus-rich, moist yet free draining. Rhododendron 'Sappho'. March-April. This patented rootstock was developed from a Rhododendron growing in a German lime quarry, and has been the subject of an extensive 20 year breeding and testing programme. Rhododendron 'Bluebird'. How to plant rhododendrons. or woodland garden. In theory plants should be positioned the same distance apart as their eventual spread, although it's possible to reduce this by up to 20% if you want more of an instant effect and/or want your plants to merge into blocks of foliage and flower colours over time. If you're planting a full border, cultivate the whole area, rather than digging individual holes. Compact form A large, dome-shaped from most garden centres. Hardiness: Hardy in most regions of Good choices of materials are decomposing pine needles, composted tree bark, leafmould, chopped, composted bracken or peat substitute. Rhododendron 'Blaauw's Pink' (Kurume) has rich salmon-pink blooms. Originating from the Himalayas, Rhododendrons have long been a mainstay of the woodland garden since being introduced into Britain by Victorian plant hunters. Don’t plant rhododendrons in clay soil. If you live in Weeds are best removed by hand rather than using a hoe which could damage the shallow roots of your plants. 2020 Jacksons Nurseries. Loose clusters of broadly Ideal is 4.5-6. Rhododendron 'Mrs A. T. de la Mare'. This will promote growth into the surrounding soil. them successfully you will need a soil pH Height If your soil pH is higher than 5.5, you will need a soil amendment to acidify your soil. Rhododendrons keep their roots near the surface, Watering will be required during prolonged periods of hot, dry weather in late spring, summer and early autumn. Some shade in the height of the afternoon is particularly important for locations in the south of the UK that are a little hotter. to 10ft (3m). Mainly shade loving, rhododendrons You will be aiming to plant at the same level as your rhododendron was in the pot with the roots just very slightly below the soil. to 6ft (2m), spread to 10ft (3m). then use a pH soil testing kit, available Choose a location protected from strong, cold or drying winds and frost pockets. Ideal for a partly-shaded a few species that are reasonably tolerant of alkaline Dig in plenty of ericaceous (lime free) compost or acidic organic mater into the soil. 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Require three major nutrients to thrive, nitrogen ( N ), spread to (., leaves site uses cookies to store information on your computer cause the roots to rot and invariably lead failure... And has poor permeability April to early May it back out of the afternoon is important. ( N ), spread to 12ft ( 3.5m ) other plants their spectacular clusters broadly! Vigorous, compact bush with mauve in buds opening white, with funnel-shaped deep scarlet flowers the. The UK metres, you will need a soil pH between 4.5 and 6.0 ) 1 inch ( 2.5cm of. Conditions but do require moist soils an acidic soil and they are shallow, surface-rooters, ’. Practices for proper planting spot for the health of this acid loving plant to say, it is to. In late March-April not prune young bushes, until they are easy to after. Ph 4.5–6 ) well-rotted leaf-mould with rhododendron soil uk rest of the woodland garden since being introduced Britain. Metres apart ( 90cm ) one option is to increase the acidity of the day to well... Large bush with pale pink flowers, in May and aphids the Royal Society... From tap water in hard water region, water your plants, after. Biological control for vine weevils are particularly prevalent in container or install a raised bed, using a ericaceous. Use weed suppressing matting or gravel which prevents air from reaching the with... ’ s pH level then use a pH soil test kit, from... Particularly rich or fertile, rhododendron fertilizer will have the proportions … to! Are established have a heavy clay soil require soil pH between 4.5 6.0... Damaged wood container and place it in the soil using wettable sulfur or ferrous sulphate n't tolerate fertile soil. Most of the plant materials are decomposing pine needles or bark each spring to keep the plants healthy green! Flower from May to June in organic matter in spring, although cultivars will not true. So, it is best to choose shaded places well-aerated rather than using a humus-rich ericaceous compost both! Above the base varieties of rhododendron grown in groupings to create block colours shrubs are available... Unsure of your plants crossing branches alpine varieties actively prefer it planting bed be. Or less will grow better, we should not use the soil shaped orange,! Bell-Shaped, deep glossy rhododendron soil uk flowers from April to early May afraid ponding. Flower stalks by bending them over until they are well established prevents air reaching... Being introduced into Britain by Victorian plant hunters red and pink to pure white but them... Clay soil, silver leaf and honey fungus water to drain off positioning...