Would this be ok for MJ plant in flower? the NPK is 10-30-30..

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ya that should be fine, if you still had the choice though I would pick something with a little more phosourous in it because thats the primary chem that makes flower florish, or buds. thats the last 30, phosourous, the middle is nitrogen which basically helps vegetative growth, like leaves and stems and stuff. so You should be good but if you can try to get something with more phosourous, hope that helps

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stonerman is mislead. that is 10% N 30% P 30% K and it may work but look at the other stuff in it, which is important. Orchid food isn't really meant for things besides orchids, you will overdo P and K without enough N, cannabis is an N loving plant. something like 20-10-10 is more appropriate for the vegetative stage, but you want to up the P for budding.

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I would be interested to know if it works for flowering though because I wondered the same thing last time I was in the garden section. Let us know how it works

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Yes I agree I didnt say the correct information, each number stands for a different chem 10-10-20 is Nitrogen-Phosphorous-Potassium and each number stands for the percentage in that bag. hope that helps

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Some strains will like it more than others.. P:K uptake can really vary across genetics.. In my experience, the more indica dominant plants like higher K than sativas, (translation, 10-30-30 might suit indicas more during flowering) but thats based on only a few select gene-pools..