ive got blood meal ,bone meal and muriate of potash any ideas on how much to put in my plant is about 3 weeks old.thanks

and how often?

You've got soil amendments. I imagine this is your first grow? Put them aside entirely for now. You'll have time later to do organic amendments.
Go with a liquid fertilizer, preferably one designed for cannabis. It will save you a lot of trouble.
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I don't claim to know the first thing about growing anything; hell, I can't make a Chia pet sprout.

i actually just put a a teaspoon of it in..can i still use liquid?and yes this is my first grow