Florist use it. Thats the green foam that hold flower arrangments in place. Most of the shops Ive worked in used 2-4 cases a week. I've had green arrangments start growing on me because everything rooted. I've even had the occasional rose take root, but that's usually depends on where the stem end was cut in relationship to location of a leaf node, & its kinda rare. Its especially good to use if you've had fungus issues. Its sterile & holds more water than a sponge.