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