roses - Knowledgebase Question

bflo, Ne
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Question by fritz208
August 3, 2010
yellow leafs on roses

Answer from NGA
August 3, 2010
Yellow leaves can be caused by many things including lack of nitrogen, insufficient light, water-logged soil (plant roots need oxygen to thrive), dry soil, or iron deficiency. If the older bottom leaves are yellow, but new growth is green, it's usually a lack of nitrogen. If new leaves are yellow, with green veins, it's usually a lack of iron. Soil should be kept moderately moist (but not wet). Finally, transplant shock can contribute to yellowing, so if new growth shows up as green, that might be the problem. Also, extreme summer temperatures can stress plants because the soil in pots heats up much higher than surrounding temperatures. Try to isolate each of these possibilities one at a time to determine the problem. Good luck!

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