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