Mushrooms grow from spores, not seeds. You can grow them indoors or -out with the right supplies.
- spores
- areas
- nutrient-rich soil
- growing bed
- hot water or a pressure cooker
- substrate
- temperature and humidity control
You need a cool and dark area, such as a basement or crawl space. Different mushroom species thrive in different substrates. Keeping your substrate clean -- to fight off competing organisms -- is very important.