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The leaves on my tomatoes are starting to look purple along the veins and on the underside of the leaves, what’s happening?

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Expert Answer

Purple leaves are an indication that the plant is not receiving enough phosphorus. If you have been using half strength fertilizer for the first three to four weeks of the seedling’s life, it may be time to increase the fertilizer to full strength. The phosphorus content (the middle number on the fertilizer analysis) should be at least 3.


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