What type and where do you get potassium?

Have alittle potassium deficiency going on, what do ya’ll use to correct this and how much. I’m using FFOF soil in week 5 of veg.

Fox farms beastie bloomz is a great option. It’s 0-45-50


thanks a ton!! I gave it a dose of Terra Vega, has some in there and might help. Definitely not a fan of FFOF.

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A natural source would be fruit-bat guano. It’s high in P and K.