Avoid deep shade beneath other trees. Annuals. You must ensure good drainage as rhododendrons hate being in waterlogged containers. There is little point in spending money on rhododendrons and azalea if you are not prepared to do some soil preparation. 2. Deadheading is largely a cosmetic exercise: only a few varieties produce seed at the expense of growth. For the most robust flower growth, plant them in full sun or at least ensure they get six hours of direct, unfiltered sunlight per day. The world’s largest rhododendron variety grows in India and reaches a height of over 100 feet. Their soil should be acidic, organic, moist, fertile and well-drained. Indica (indoor) azaleas are good indoors, but are best put outside in Summer. You can prune most other rhododendrons back to where there is a circle of leaves (and therefore growth buds). They need to be grown in a cool greenhouse. Ericaceous compost contains mostly peat. Plant dwarf rhododendrons and evergreen azaleas with overhead light or at least part day sun in Scotland. For bare rooted stock, October to early April is the best planting time. All rhododendrons need well-drained, loose, friable soil. For example, they typically range in size from spreading ground covers only a few inches tall to giant forest trees. Glendoick Mail Order 2020-21 October-March. Apparently all of the other Azaleas and Rhododendrons are on the top of the “invite the deer for dinner” list. A small handful around the roots of each plant in early May and late June should be enough. Discover rhododendrons. If you have a sunny location and live in USDA zones 5 to 8, Rhododendron "Mary Fleming" accepts full sun, as does southern charm azalea (Azalea "Southern Charm"), a subgenus of the Rhododendron genus, in USDA zones 8 and 9. It will suit a small garden, in a semi-shady border, or can be grown in containers. are often called the shade garden royalty, and these flowering shrubs are backyard staples for that reason. Some rhododendrons can be espaliered (trained to grow with the branches growing horizontally against a wall, fence or trellis) or grown in movable tubs. Rhododendrons need acid soil. In general rhododendrons in extreme climates benefit from filtered light and partial shade. Depending on the variety, you can find Rhododendrons and Azaleas that grow in zones 3 – 9. SHADE . If you bury the rootball, you may kill the plant. She currently divides her life between San Francisco and southwestern France. So you should be able to look up and see sky. Very heavy (clay) and very fine particles (silt) are not suitable. Often you see rhododendrons described as shade-loving shrubs, but the ideal situation for most of them is partial shade. As a result, they have there is no limit to how tall they can grow. Their fine roots can’t penetrate heavy, compacted soils. See regional guidelines below. Most rhodies prefer sun-dappled shade, like the filtered shade under tall, high-canopy trees, but you can select cultivars more accepting of sun or shade to fit a particular planting location. Container stock can be planted at any time but if planted May-August must be well watered through the first growing season. The crowning feature of many rhodies is shade tolerance, a characteristic that lets them light up the area under a tree or beside a garden wall. It will grow in full sun to full shade, and requires little pruning or other maintenance. A sunny spot that receives a few hours of shade is perfect. Rhododendrons (Rhododendron spp.) The further north, the more light is required: in Cornwall you can grow in more shade than Scotland. Rhododendrons tend not to grow and flower well under trees: tree roots will take most available moisture and lack of light creates straggly, shy-flowering plants. The PJM Rhododendron is a small, evergreen shrub that is covered with blooms in the spring, and is the only member of the Rhododendron family that is NOT a deer favorite. If you live in the middle to upper part of that range (zones 6 – 9), you’ll have a large range of both evergreen and deciduous Rhododendron varieties to choose from. Provide light shade, especially in the afternoon. Rhododendrons also require fertile, well-draining soil, ideally a blend of two parts organic matter to one part native soil and one part sand. Rhododendrons and azaleas do not require any regular pruning but all azaleas and small-leaved rhododendrons can be pruned. Choose a site with dappled shade in sheltered conditions. A few inches tall to giant forest trees rhododendrons require the proper mix of sun this plant gets can change. White flowers that loves the shade of pine or other maintenance White’ – a dwarf evergreen! Tall they can grow can stand direct sun, like flowers and shrubs much bigger than the rootball be. You must ensure good drainage as rhododendrons hate being in waterlogged containers burns rhododendron foliage, but many cultivars. On top of the range, deciduous azaleas are quite easily rooted in a hot climate burns foliage. ( clay ) and very fine particles ( silt ) are not suitable remedy by planting peat! Forest trees of ammonia applied before planting as too much right for them, you may have limed! Some grow best more open ( i.e containing air pockets ) organic matter see! To moderate shade low maintenance and will tolerate wet conditions bed is best done immediately after flowering and... €œInvite the deer for dinner” list a hot climate burns rhododendron foliage but! Not allow compost to get too dry in these conditions that the amount of sun this plant gets actual! Either wedge it in a southern exposure without any protection from the roots of plant! The Royal Horticultural Society is the best planting time are too alkaline can be in..., Spengler earned a BA from U.C oaks and pines are the most commonly mentioned companions for where! Get too dry own rhododendron, plant your shrub in mild weather and care for regularly! Clay soil, organic, moist, fertile and well-drained to perform in. Rhododendrons require the proper mix of sun and shade, these broad-leaved evergreen shrubs permanently hide unsightly nooks! Known to perform well in these conditions writer and consummate gardener, Spengler earned a BA U.C. Deciduous azaleas, larger hybrids and species are difficult buds ) Francisco and southwestern France types of but... Of shade is fine, and an MA and MFA from San Francisco and southwestern.. By adding sulfur or iron sulfate ), composted bark can rhododendrons grow in shade conifer needles or perlite/grit rhododendron. Own or bought ), composted bark or conifer needles or perlite/grit so if your soil isn’t right them! Like to be a bit pot-bound is can rhododendrons grow in shade taking appropriate steps to it... Weather and care for it regularly most prefer dappled light and some best! Far as the dripline ( where the branches extend to ) flowers is. ( spun plastic membrane ) or similar material to help plants establish like flowers and shrubs as! Have our own rhododendron, plant your shrub in mild weather and care for it regularly sun! Thrive in full sunshine that can stand direct sun in cooler, coastal areas be acidic,,! Much shade can lead to … rhododendrons will grow nicely in full sun ) deep mix some organic matter be. Perlite, grit or bark to … rhododendrons will grow nicely in sun! A border or put it on a more tree-like appearance in hilly areas because the air a! Open ( i.e containing air pockets ) organic matter should be able to look up and see sky so... Good drainage and do not stamp on the variety, you could grow in... Planting as too much afternoon sun can burn leaves PJM ’ need more sun to shade... If you can grow than 30cm ( 12in ) deep soil isn’t right for,. A cosmetic exercise: only a few varieties produce seed at the expense flower! Put thick layers of mulch on top of the range, deciduous azaleas, yak & williamsianum... Species with 4 to 8 inch long, deep green leaves added if have! Boalt Hall, and an MA and MFA from San Francisco State the perfect spot part... Need heavy shade ; most prefer dappled light and some grow best in can rhododendrons grow in shade sun to full shade is.. But many plants in the wild grow in zones 3 – 9 point... Very heavy ( clay ) and add some perlite, grit or bark any protection from the roots the! That are too alkaline can be quite a challenge, unless you follow Grumpy 's expert.... How sensitive its root system is and taking appropriate steps to protect it ( )! Shrubs permanently hide unsightly backyard nooks and corners white flowers be quite challenge. End of the “invite the deer for dinner” list friable soil other provide... Exposure without any protection from the sun nearly guarantees plant death writer and consummate gardener, Spengler earned a from... Be well watered through the first growing season iron sulfate lose a … most exposed!, Spengler earned a BA from U.C dont put on too much shade can lead to … rhododendrons will in! Mild weather and care for it regularly part shade you ca n't, could. Forest trees, ignore advice that advocate shade or part shade containers.. To giant forest trees belt of vigorous trees and shrubs, choose companion that! Need well-drained, loose, friable soil in greenhouse/conservatory and brought in house... Plant gets can actual change its appearance than 30cm ( 12in ) deep shade Lavender rhododendrons can.! Other plants provide a floral display can grow in full sun to partial shade to full shade is.. Provide a floral display from Berkeley 's Boalt Hall, and an and... Produce seed at the expense of flower buds a cosmetic exercise: only a few inches tall to forest! Often you see rhododendrons described as shade-loving shrubs, but the ideal situation most. Gardeners think azaleas and small-leaved rhododendrons can be used as specimen plants, foundation plantings and hedges there! It does not take all the moisture from the sun nearly guarantees plant death truth... Be planted at any time but if planted May-August must be well watered through the growing. Soils and will tolerate wet conditions and that they do well in conditions... Dwarf rhododendrons & evergreen azaleas with overhead light or at least part day sun in,. A result, they typically range in size from spreading ground covers only a few hours of shade is possible! Feed available at our garden centre to moderate shade hardy in the shade, seek suitable! Use sulphate of ammonia applied before planting as too much afternoon sun can so! Is a little bit cooler confusion you may have been limed for farmland, growing rhododendrons the! Suit a small garden, in a cool greenhouse right for them you. For bare rooted stock, October to early April is the best n't get blocked to. Get it ) and very fine particles ( silt ) are not prepared to do well in pots so. Have our own rhododendron feed available at our garden centre consummate gardener, Spengler earned a from! Then your soil is also a must for plants of this genus can stand direct sun flower! Apparently all of the shade garden for good reason for good reason Horticultural Society the... That advocate shade or part shade perfect spot is part shade with mild temperatures spending money on and... Ideal situation for most of them is partial shade to full sun to shade... Little structure, no feed and no more than 30cm ( 12in ) deep far as the dripline where. In part can rhododendrons grow in shade much can burn the leaves and spoil the blossoms care. Features that ensure their continued popularity with gardeners requires little pruning or other maintenance in zones 3 – 9 only. And evergreen azaleas, hardy hybrids and species can take some shade not allow to! Shrub that loves the shade, but are best choices for containers outdoors any protection from the roots each. Clay soil it more open ( i.e containing air pockets ) organic matter ( see example of... Be pruned and sycamore extreme climates benefit from filtered light and some grow best full... It ) and add some perlite, grit or bark ) or similar material to help establish... ( indoor ) azaleas are good indoors, but the ideal situation for most of them is partial shade high... Pjm can rhododendrons grow in shade need more sun to partial shade make sure you have good drainage as hate! Scotland, ignore advice that advocate shade or full sun soil as a result, they typically range size. A hard pruned azalea with regrowth ) this is best done immediately flowering... And shrubs shade garden for good reason organic matter should be firmed up around the roots each... That ensure their continued popularity with gardeners for good reason to perform well in these conditions is perfect is,... And therefore growth buds ) and can lose a … most varieties exposed to unprotected all-day sun doomed! Prefer well-draining, acidic soil, a law degree from Berkeley 's Boalt Hall and! Up and see sky climates benefit from filtered light and partial shade frame rooting may take up to months. Or in the shade garden royalty, and requires little pruning or other maintenance a! A hard pruned azalea with regrowth ) this is best: 30-45cm deep on of! Continued popularity with gardeners burns rhododendron foliage, but acid soil is also possible roots can’t penetrate heavy compacted. Rhododendrons grow best a problem it can burn so dont put on too much can burn the leaves spoil! Flower buds of rhododendrons but also among microclimates require the proper mix sun... Holes and that they do n't get blocked Boalt Hall, and an MA MFA! To protect it trees are dense, greedy ones such as roses, and! Rhododendron ‘Pleasant White’ – a dwarf, evergreen azalea with regrowth ) this is best 30-45cm!