Bush Doctor Boomerang- qt, Boomerang® lends a hand when the stresses of temperature fluctuations, unintentional neglect, and mineral salt build up knock your beauties down for the count. The soil microbes in Boomerang® help support the root zone. Boomerang® can also be used as a vegetative supplement. It contains solubilized nutrition that is immediately available to plants. Bush Doctor® Boomerang® is the “Comeback Formula” that gives your plants a fighting chance.