Fall is one of the best times of the year for root growth. As fall comes, day length shortens, temperatures drop, and the above ground part of the tree goes into dormancy. The tree is still actively growing below ground. As the root system grows, it is also absorbing nutrients to help store for future use. Deep root fertilizing will help increase health and vigor of your tree. In addition to slow release nutrients, our fertilizer has micro-nutrients, organic material, and microbial spores to help increase the health of the soil. The fertilizer we use is a much better product for the soil, tree, and the environment.