The beautiful, bright green velvet appearance is weed free, since it is greenhouse grown in sterilized soil. Shelf life is indefinite, as spores are packed in a zip-lock bag within the envelope. Cover up to 3 square feet. 1/2 ounce net. wt. Great for Japanese gardens and other landscape features. The moss grown from these spores are a favorite in Bonsai for it's beautiful, bright green velvety appearance. Unlike most varieties, it remains smooth, even when mature. KEEP IN MIND: Moss DOES like: humidity, coolness, shade or indirect sun. Moss DOES NOT like: Much sun, heat, fertilizer, dry spells, or handling. Old Japanese saying: "Moss is like people, one must have patience". Please message me with any issue I am sure we can work it out! Just take a minute, send me a message and I am sure I can make you happy. I am very nice and try my hardest to treat my buyers the way I would like to be treated. Thank You, Syukur