Bloom CityOrganic SuperGreen Kelp Foliar Spray for Plants, Quart (32 oz)

Q: I want to apply this to the root zone, what is the suggested ml/gal?

There is none, however it’s manganese and the concentration is is listed on the bottle. You can do your own calculations if you are so inclined. I routinely feed the roots with any leftover solution with no ill effect.

Q: How long will a mixed batch keep at room temps, 78 F or lower?

The manufacturer recommends using it within four to five hours of mixing.

Q: How much do I use if i want to use it in my feed water?

While there are no specific product instructions for this use, it is simply a highly soluble magnesium from kelp. The instructions for foliar feeding should also work well for feed water.