Espoma (BTSP25 Biotone Starter and Natural Plant Food 25lb Contains hundreds of thousands of living microbes and both endo and ecto mycorrhizae plus humates that when combined with our all natural and organic plant foods have been proven to promote faster establishment, deeper roots, and superior soil structure It helps prevent transplant loss and promotes bigger blooms Made in United States All natural plant food enhanced with biostimulants, beneficial bacteria, and mycorrhizae Proprietary formula works naturally within soil to help plants establish quickly, withstand environmental stress, promote deeper roots and better blooms, improve soil structure Includes both endo and ecto mycorrhizae and no fillers, sludge, or inert ingredients are ever used Grows larger root masses and reduces transplant loss Carefully developed with nursery and horticultural professionals to produce outstanding flowers, shrubs, and vegetables