Fox Farm Boomerang Comeback Liquid Formula  2 - 0.2 - 0.3 does what its name says, helps plants "Comback". It helps plants with stresses of temperature fluctuations, unintentional neglect, and mineral salts.  Derived from: Earthworm castings, magnesium sulfate, sodium borate, copper sulfate, ferrous sulfate, manganese sulfate, zinc sulfate, protein hydrolysate, kelp.   In-ground gardens and container plants Mix 2 to 4 teaspoons per gallon fresh water and repeat weekly until plants bounce back.  Hydroponic mix 1 Tablespoon per gallon of fresh reservoir water, empty reservoir and fill with fresh water, add boomerang.