This is because Rhododendrons (generally) carry dormant buds below the bark even in the oldest, mature wood and these buds will shoot if all the growth above them is removed. Prune away any dying tissue. The temperature and humidity in your home can play a factor as well, though. Learn which plants thrive in your Hardiness Zone with our new interactive map! Curious to see if the shrub would recover on its own, I trimmed it back a bit, cut back the scaffold of branches to as pleasing a shape as possible, and waited to see what would happen. The Royal Horticultural Society is the UK’s leading gardening charity. Worldwide there are hundreds of species of rhododendrons with blossoms in every color in the rainbow. The azalea is part of the genus Rhododendron and therefore originates from the same genus as the rhododendron plant. This is caused by several types of fungus and the humid summer temperatures. All Rights Reserved. Rhododendrons can easily become stressed due to their shallow root system and their preference for rich and acidic soil. But opting out of some of these cookies may have an effect on your browsing experience. Rhododendrons encounter diseases, fungi, and climatic issues that can result in brown spots, or even entirely brown leaves. The buds need light to encourage them to open. Rhododendrons range from tree sized plants to tiny shrubs. It can be grueling and stressful if you don't have the right skills. Check your soil drainage for fast water runoff and make soil amendments to correct this. This may damage them if done without moderation. Morning light is the only direct sunlight your plant should receive. They are more of an indoor problem to a potted plant than an outdoor but they cause death when the plant is young. Grow groups of 3-5 of the same variety in loose drifts and choose an overarching scheme of around 3 colours if you have a larger area to plant up. Most rhododendron sources indicate the lowest temperature range in which rhododendrons can be successfully grown. Water your rhododendron deeply from a foot out from the trunk to at least a foot past the drip line of the shrub. Then remove cross branches and weak wood. Aug 29, 2019 - Signs of rhododendron distress can usually be traced to incorrect culture or siting. Control measures involve pruning out the infected areas. Rhododendrons are fibrous, shallow rooted plants that need good drainage to perform well. Reduce the usage of nitrogen fertilizer as too many results in the buds not to bloom. Drought, too much sun, root abrasion, poor soil quality, over fertilizing or under fertilizing and lack of mulch to insulate the roots can all create an under-performing or struggling rhododendron or azalea. Rhododendron Classifications Rhododendrons are broadly classified into 6 main categories. Rhododendrons are members of the Ericaceae (Heath) family of plants and as such are related to Azaleas, Heathers, Blueberries, Arbutus trees and more. Here are a few tips on how to successfully grow rhododendron in containers: • Choosing the right container: When selecting the right pot, you must take into consideration the size of your rhododendron because the size of the plant and the size of the container go hand in hand. The leaves are thick and leathery and evergreen in all the species except the azalea species. Use what is recommended but no more, as excess fertilizer can cause further stress and damage to the plant. I planted a rhododendron over a month ago, and it was doing so well. Remove the plant from its container and place it in the planting hole. The aim of most pruning is to keep plants healthy and improve flowering, by removing older, less productive wood. Little cultivation should be done around rhododendrons due to their shallow roots. 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