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When switch fertilizer? Hi :)When switch fertilizer? Hi :) I'm wondering when I should switch to a high phosphorus and/or potassium fertilizer? I've been feeding my pumpkin plants high nitrogen plant food. They are still fairly small, main vines about 3 feet and the first male flowers appearing (but not blossoming yet). I'm really hoping to get the most out of my pumpkin patch this year and any advice much MUCH appreciated!!