Fully hardy. Ask Question Asked 3 years, 3 months ago. Active 3 years, 2 months ago. Produces dome-shaped trusses of 10-12 flowers. Another potential cause of azaleas with yellow leaves is alkaline soil. Has an upright, dense growth habit. I can't recall the variety but the flowers are creamy pale yellow and bloom in early May, see photo. The leaves have a chemical called grayanotoxin that can cause anything from gastrointestinal distress to death. The Victoria Rhododendron Society adds that older leaves naturally turn yellow, and they are replaced every one to three years. Reasons include: because they are too wet, too dry, planted too deep, starved (needing feeding), soil too alkaline, or so il … Broadly oval leaves are silvery at first, maturing to deepest green, and are brown felted beneath. In late spring has funnel shaped pink flowers that fade to near white., May Rhododendrons originate mainly from the Himalayas where about 600 different Rhododendron species can be found. These range from those in the Tender section at lower elevations around 2500 metres. I have a 3 year old Rhody from Tsugawa nursery. Rhododendron 'Catawbiense Grandiflorum' is a bushy, dense, evergreen shrub. Azaleas and rhododendrons require acidic soils and will thrive in soils between pH 4-6 with pH 5.5 considered ideal (pH 7 is neutral and a value above pH 7 is alkaline). Leaves are elliptic, flat, semi-glossy & dark yellowish-green. 2017, 1st june Soon after planting my rhododendron, leaves are turning yellow with black/brownish patches. In the past two years the leaves are yellowing and also something is eating the leaf margins, see other photo. They avoid only those plants with large leathery leaves or leaves with indumentum (a fuzzy underside). Is it dying? There are several reasons that this may happen. However, deer seem to graze on young plants or small-leaf varieties of both rhododendron and azaleas without negative results. Yellow leaves on rhododendron. Don’t panic if the spring growth on your rhododendrons looks a little pale, however, because it is natural for the foliage to hold its “spring green” color for a … Blooms mid to late spring & reaches roughly 4 feet tall. Diagnosing Rhododendron Problems Yellow Leaves Chlorotic (pale) leaves are a sign of low fertility for all types of plants, not just rhododendrons. The oldest leaves are first to drop, leaves higher up the plant may also show signs of browning on the edges or the tip. When the leaves are yellow but the region along the veins remains dark green, the plant likely suffers from chlorosis, which is … Why Is My Rhododendron Drooping? Yellowing rhododendron leaves. During a cold snap, your rhododendron’s leaves may droop, but should usually recover when milder weather returns. The shiny, rich-green leaves are paler green underneath, providing year round colour and structure in the garden. Evergreen, dome shaped rhododendron of neat, compact habit. So why has my rhododendron got yellow leaves? Edit (2017, 12th july): I … This disease, caused by the fungus Glomerella cingulata, results in rounded spots on the leaves.Although it’s unsightly, leaf spot is only a significant problem on poorly growing or unhealthy plants, which might end up dropping a substantial number of leaves. of the leaf. Can I do anything about it? Flowers are openly funnel-shaped with wavy edges, light yellow, edged with½" of red, outside mostly red with some light yellow near the base. Why Have The Leaves On My Rhododendron Turned Yellow? Big Leaved Species with their massive leaves up to 75cm long, grow in conifer forests around 3000metres. Viewed 1k times 3. Yellow leaves could be a sign of stress as a result of soils that are alkaline rather then acidic. Asked January 15, 2019, 3:09 PM EST. Rhododendrons which are not happy tend to show this by their leaves turning yellow. 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