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
Brand	General Hydroponics
Brand Name	General Hydroponics
Coverage	Organic
Customer Reviews	4.6 out of 5 stars 1,043 Reviews
Item Form	Liquid
Item Weight	0.01 Ounces
Item form	Liquid
Item weight	0.01 Ounces
Liquid Volume	16 Fluid Ounces
Liquid volume	16 Fluid Ounces
Manufacturer	General Hydroponics
Mixing Ratio	1:1:1
Model Number	GH FloraSeries Trio
Specific Uses For Product	Hydroponics
Specific uses for product	Hydroponics
Target Species	plants
Unit Count	48.0 Grams

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

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