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