For an indoor potting mix, topsoil is not a good mix. It can lack many nutrients that the plant requires. For cow manure, it should be well aged for at least 6 months before being used. Mixing the manure with the organic potting soil mix will work just fine.
Hi Andre,
For an indoor potting mix, topsoil is not a good mix. It can lack many nutrients that the plant requires. For cow manure, it should be well aged for at least 6 months before being used. Mixing the manure with the organic potting soil mix will work just fine.