Does it come with directions?

Yes it’s listed on the backs of all bottles. For seedlings, veg and bloom.

can you premix these and store for later use? or do you have to wait to mix only when you're going to use?

Since I just dump the mixture into my water reservoir as needed, I'm not sure what you mean by mix. It comes with directions for dilution into the water so you just use as much as you need.

ASIN	B00CR0KDIK
Item model number	GH FloraSeries Trio
Manufacturer	General Hydroponics
Product Dimensions	20.32 x 3.81 x 12.7 cm; 0.28 g

GH General Hydroponics Flora Series: FloraGro, FloraBloom, FloraMicro 16oz

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