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Originally Posted by JodoGarden
Thanks Mark. I thought it was normal up until I read the nutrient article and the K deficiency looked pretty close to my plant... being FL I would be surprised of any kind of nutrient deficiency that sprung up.
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It could be a K deficiency, but if so, it's not extreme given that its only affecting the oldest leaf. But really, tissue analysis is the only way to tell for sure. And keep in mind that climate affects the ability of the plant to uptake and transport nutrients, so it could be as simple as Tony says. There might be plenty of nutrients, but cooler weather is making it harder for the plant to absorb them and move them through the tissues.