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Old June 16, 2017   #3
gdaddybill
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Join Date: Apr 2011
Location: Burton, TX
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It looks like fairly extreme nutrient deficiency. Low phosphorous can cause the purplish cast but I think the plants need a good balanced fertilizer. Try an organic like 4-4-3 + CA on the soil and foliar applications with a hose-on sprayer. The sprayer type that you put in the container straight and it blends from the saturated solution at the top(no rubber hose in the container) are relatively safe to use. There shouldn't be any foliage burn if the soil is watered first.
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