50% compost may be too high, although I don't know anything about mushroom compost. Worm castings are great, and some peat moss or coco coir would be good too. A more standard mix may be more like equal parts perlite, worm castings, and coco coir or peat. Or like 50% perlite, then equal parts worm castings and peat or coir. I have a hunch that it wouldn't be a good idea to use more than 20% mushroom compost, but then again I don't really know. Have fun mixing up your soil
phytokind Reviewed by phytokind on . Good Soil Mix? I was thinking about using 50% mushroom compost and 50% perlite for my next grow. I have 4 little widow seedlings needing a new home. Anybody see a problem with this? Its about impossible to get promix for a decent price where I live. Thanks for your opinion......:D Rating: 5