Rhododendron/Azaleas
- Hazel Boswell
- Jun 29
- 2 min read
Did you know that the word RHODODENDRON comes from Greek (rodon) meaning rose and (dendron) meaning tree. Now you can understand why so many rhododendrons can be the size of trees.
Rhododendrons and Azaleas are a genus of evergreen and deciduous shrubs; they are part of the ericaceae family. Ranging in size from large-leaved to dwarf species, some are fully hardy to frost tender. They are shallow rooted plants which like acidic soil, and most importantly moist soil.
Rhododendrons became very popular in the UK in the early 18th century. Unfortunately rhododendron ponticum, which originated from the Black sea region has become very invasive and is a problem to the ecosystem of our native flora. Here in the garden we are gradually taking ponticum out.
Take a closer look at the leaves of rhododendrons and you will notice some have Indumentum and Tomentum.
Indumentum (Latin garment) is a velvety layer of fine woolly hairs on the underside of some leaves, which plays a role in protecting the plant from moisture loss and also provides a physical barrier to pests. Usually a brown cinnamon shade,
Tomentum is a coating of fine hairs but on the upper part of the leaves. More prominent on emerging leaves, it provides protection from harsh weather and pests, but can be mistaken for mildew by some gardeners.
Rhododendron leaf shape
They can be rounded, oval or pointed and tend to be quite thick so take longer to break down. Leaves play an important role in protecting the plant; typically you can see very curled up leaves on cold icy days then once the heat builds they will uncurl.
In the garden you will find large leaf varieties of Rex,Sinogrande, Indumentum, varieties of
yakushimanum, bureavii, and Sir Charles Lemon.
Azalea leaves tend to be thinner.
Flowers can be large and showy on some varieties while others tend to be smaller, also some have an amazing scent. Flowering time is usually April to June but recently we have seen them beginning to bloom as early as February.
Types of diseases to look out for:
Phytophthora
Honey fungus
Bud blast
Powdery mildew
Leaf spots
Silver leaf.
Types of pest:
Scale insects
Aphids
Vine weevils
Pamela Bruce - Gardener
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Walking through a garden thick with rhododendrons feels like stepping into a lush, green embrace, where every leaf and flower seems to whisper stories of nature’s resilience. I spent a while on https://ai-best-chat.com/review/evening-honey-ai recently, and it reminded me how important it is to cultivate spaces that reflect the beauty and complexity of life. The way their thick leaves curl protectively in the cold, only to unfurl and flourish with warmth, creates a sense of anticipation that’s almost palpable. In that moment, I felt deeply connected to the rhythms of the earth, as if each bloom was a celebration of survival and beauty.