The Q&A Archives: Upright Hypericum Yellowing Leaves

Question: New Hypericum, 18" tall, buds are ready to open but some leaves are yellowing. Its in a good site with full sun. Our soil is clay but has been amended and its in a raised bed. No bugs are evident. Have any ideas?

Answer: 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. (Lack of nitrogen is a more common problem than lack of iron.) Soil should be kept moderately moist (but not wet). Finally, transplant shock can contribute to yellowing. If new growth shows up as green, that might be the problem.

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