When growing mushrooms from store bought stems, the process is quicker because you don’t need to rely on spores and can use the mycelium already on the fungi. Want something to do with your used coffee grounds? 10 Fruits Vegetables You Can Plant Once -- And They Will Keep Coming Back Every Year By Sybil Plants Garden Gardening Tips Shake it around until the level is even. Growing mushrooms in coffee grounds from stems . They were growing quite nicely and the tops had turned up. There are quite a few methods of growing mushrooms in coffee grounds, but the idea is consistent: In this video we try to get white button mushrooms from the store to regrow in used coffee ground. Wait until your coffee grounds are cool enough that they are no longer steaming, but not quite cold and put one pot worth of grounds, including the filter, in a bag or jar. You may need to collect coffee over time to get enough. Mushrooms need to grow in a sterilized media so that they won’t compete with o...