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