We use this marvelous product with exceptional results on our heavy clay soil.  It naturally loosens the soil to enable the iris to produce deeper rooting resulting in bigger rhizomes for you, our customers!  It will work for you as well.  This stuff is MAGIC. 

Monty?s Liquid Carbon is derived from 100% natural elements and is completely safe and non-toxic for use in all lawn and commercial / agricultural applications. Monty?s Liquid Carbon is not a fertilizer or a fertilizer replacement; it is intended to be used as a soil conditioner in conjunction with your current fertilization program.  Monty?s Liquid Carbon will begin feeding microbes in the soil that increase the cation exchange in the root zone. This can be applied to the soil in the fall or early spring. One 32 ounce bottle will treat 20,000 square feet!!