Abstract: A water-suspensible, dry, vitamin-hormone horticultural product for promoting plant root growth comprising a combination of one or more plant growth regulators, mycorrhizae, vitamins B1 and B6, sea kelp and beneficial microbes in a carrier. In one embodiment the product is a dry powder of about 2.00 wt % indole-3-butyric acid in crystalline solid form; about 0.20 wt % thiamine mononitrate (B1) in water-soluble powder form; about 0.20 wt % pyridoxine HCl (B6) in water-soluble powder form; about 2.64 wt % Mycorrhizae in water-soluble powder form; about 1.06 wt % sea kelp extract in brown flake form; about 0.88 wt % Bacillus amyloliquefaciens in water-soluble powder form; about 0.07 wt % sodium lauryl sulfoacetate in water-soluble powder form; and about 92.35 wt % maltodextrin in water-soluble powder form.