Baby bella, also called cremini, refers to young brown mushrooms of the species Agaricus bisporus. Portobello mushrooms are the larger, mature form. A white button mushroom does not simply become brown because it is left to grow longer.
Start with an identified edible culture
For a first home crop, a prepared growing kit from a mushroom supplier is a practical option. Check that the kit is specifically for brown Agaricus bisporus. Follow its instructions for opening, watering, temperature and harvesting.
Why ordinary garden compost is not enough
Commercial Agaricus production uses carefully prepared and conditioned substrate, an introduced mushroom culture called spawn, and a casing layer. Managing those stages is different from planting vegetable seeds in potting mix.
Sprinkling spores into ordinary compost does not provide the same controlled start. If you want to grow beyond a kit, study an Agaricus-specific method and obtain appropriate spawn and substrate rather than using a generic mushroom recipe.
Monitor the growing conditions
Use the supplier's directions for the particular kit and stage of growth. Keep equipment clean and manage moisture and ventilation as instructed. There is no universal temperature or number of days that guarantees a crop from every kit.
Harvest only the intended crop
Harvest the identified mushrooms from your kit at the stage recommended by its supplier. Do not eat an unidentified mushroom merely because it appears nearby or resembles the expected crop. Keep home cultivation separate from wild-mushroom identification.
Gardeners Basics does not sell live plants or mushroom growing cultures. This guide explains the process so you can choose suitable mushroom-growing supplies from a specialist.
