Big Foot Mycorrhizae Root Boost, 15 lb.Big Foot Root Boost waters into your existing plants and helps build healthy, vibrant roots. Big Foot Root Boost contains Azospirillum brasilense, an all natural, powerful nitrogen fixing beneficial bacteria that lets your plants thrive in the soil it's already in and can help new plants and cutting establish roots faster. It's safe to use on any rooting plant, and simple enough for gardeners of any level Whether starting from seed, working with