Flora Gro is part of a series. Do you also have the Flora Micro and Flora Bloom? You get all three parts and mix the parts in water. I haven't grown with GH in a few years so dont remember but am pretty sure there is a feeding chart you follow that tells you how much of each part to mix depending on what stage your plant is in. I switched to Blue Planet and they have the chart on the bottle so I can mix it pretty easily, but know GH has one on their website. Hope that helps.
You already have micro and bloom so just use the lucas formula. 5 mills micro and 10 mills bloom for cfls and under 400 watt hid or 8 mills micro and 16 mills bloom for 400+ watt hid. Just need some cal/mag n ur good to go
In Veg:
gro = 3 Parts
micro = 2 Parts
bloom = 1 Part
Transition:
Gro = 1 part
Micro = 1 part
Bloom = 1 Part
In Flower:
Gro = 1 Part
Micro = 2 Parts
Bloom = 3 parts
Keep in mind that this is a blanket guideline and will not be 100% accurate for every grow or plant. Always start nutes at 25% or less than what is written on the bottle.