My autoflower is about 4 ft tall and starting to grow buds nicely my question is what nutrients should I be giving it during the flower stage
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Feeding should be managed by measuring runoff PPM (parts per million of nutrients in your soil.) That said, when flowering starts you will want to begin feeding P and K (phosphorous and potassium.)
Autos are more sensitive to nutrients, so you need to be careful how much you feed (again - measure PPM.)
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Should I be adding calcium to it also to keep the leaves from yellowing ? A guy from the local grow store gave me some buds and Bloom nutrient and he told me with autoflowers to just do a quarter strength
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Cal-mag is generally used for indoor grow. As for the nutes you have, not knowing what brand, ect, yes, I would start with 1/4 to 1/3 recommended dose.
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If you haven’t been feeding to this point you should probably have a complete base feeding that is mixed according to early flowering directions. The company that makes isn’t as important as making sure you’re getting plants all required macro and micronutrients. Most will have a 3 part system that should cover most of your plants needs. Then use accompanied schedule to mix.