Hair Cap Moss: Great For Terrariums!!! Pesticide-free. Live moss that is perfect for your terrarium or garden. This is a ground cover moss and is heavy because the soil is attached to the bottom. It resembles little palm trees which work well for terrariums! The moss will be similar to what is pictured. You will get an assortment of sizes in a 1 square foot. Has a shelf life of 2 to 3 weeks if kept refrigerated. Live  moss for terrariums. One square-foot- of moss.