Rhodos in Sun

pallas_nj(NJ shore)May 22, 2006

Ok. I know Rhodos in bright light is a no-no---so my Rhodo leaves are turning yellow. Is there anything I can fertilize this plant with to help it out. Its too big to move.

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rhodyman(SE PA, USDA Z6)

Yellowing of leaves surfaces, often with brownish burned areas, occurring on leaves that are more exposed to sun, is caused by more sun exposure than the plant is able to tolerate. Some varieties need shade, while all plants that have been protected from direct sun will be tender until hardened off by gradual exposure to sun light. Possible solutions are to give the plant more shade or move it to a more protected site.

Uniformly yellowish-green leaves is often just the need for more nitrogen. This will be more noticeable in the full sun. Some less sun tolerant varieties will always be light green in full sun.

Yellowing of a leaf between dark green veins is called chlorosis. Many conditions can be responsible. Poor drainage, planting too deeply, heavy soil with poor aeration, insect or fungus damage in the root zone and lack of moisture all induce chlorosis. After these conditions are eliminated as possible causes, soil testing is in order. Chlorosis can be caused by malnutrition caused by alkalinity of the soil, potassium deficiency, calcium deficiency, iron deficiency or magnesium deficiency. A combination of acidification with sulfur and iron supplements such as chelated iron or iron sulfate will usually treat this problem. Chlorosis can also be caused by nitrogen toxicity (usually caused by nitrate fertilizers) or other conditions that damage the roots such as root rot, severe cutting of the roots, root weevils or root death caused by extreme amounts of fertilizer.

    Bookmark   May 22, 2006 at 7:58PM
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Birdsong72(7/Northshore NJ)

Thanks Mr. Henning. At least I have the benefit of your expertise. A day without learning something isn't a good day in my opinion.

    Bookmark   May 24, 2006 at 9:03AM
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