I've been growing mushrooms for a while. It's been a massive learning curve. Getting one's head around working in a sterile environment is critical as the mycelium is very fragile and succumbs to attack by mold spores when it is kicking off. If forest green mold had a market value I'd be on a winner. Anyone who believes that they can keep anything sterile ought to try working with Petri dishes and agar. You absolutely have to work in front of a HEPA hood.
I've got seven different varieties growing at the moment. My intention is to develop it into a business and I've been trying to work out a way to keep costs at a minimum and productivity at a maximum. I had a break through whist I had Ross River virus. I fell behind my target owing to being crook but chanced on a method of substrate sterilisation which utilises hydrated lime. I'd been using a pressure cooker which has obvious drawbacks, not least energy costs but also very limited to the quantity I can process. There are masses of how to videos on the net and it was this one which provide the breakthrough.
I settled on oyster mushrooms primarily, pink, yellow and pearl because the climate here suits them the best but also ulmarius, shimejei ( which I cloned from the supermarket), turkey tail and lions mane.
They oyster varieties fetch $30 a kilo. There is little competition as the shelf life is very limited and they have to be sold fresh.
All of them will pretty much colonise anything organic and I'm trying to figure out a way to automate bulk sterilisation of hardwood sawdust because it is free but you can use straw, sugar cane mulch coffee grounds, cow dung, wood pellets etc..
I produce all my own grain spawn and use oats which have been sterilised in my pressure cooker. I kicked off growing out in 2 kilo bags but have started to used poly tubing in bags that weigh 10 kilos. The smaller bags are pretty dear and take up far too much space.
Turkey tail is worth $60 but is very slow growing. Has a great reputation as a medicinal mushroom.
Bulk sterilising substrate in hydrated lime

Spawn bags

HEPA filter

Shimejei

Grow room - need fresh air, light and I use an ultrasonic humidifier

Turkey tail - these are nearly four months old

Bulk grow bags growing on sugar cane much and sawdust

Forest green mold - the bane of my existence

All American pressure cooker - does 8 spawn bags in a batch, sterilised for two hours