How many plants per m² in garden (no pots)

Make what’s called a SOG! (seeds of green) 😉. BUT still about 4 per square meter. And remember to hit the right pH. But yeah, it looks like you’ve got your shit under control. If you’re interested in a sponsorship deal for nutrients, feel free to message me privately. I’m a seller for Terra Power Nutrients in Denmark, the only one selling this in the Nordics. And it kicks ass!

Maybe 3, it depends on whether it's fimz or auto flower.

As someone who has been growing outdoors for close to 40 years, I would suggest one plant per square meter as the minimum distance between plants, with with one and a hal to two metres even better. Any closer than one metre and they will end up tall spindly plants that compete for light and will not grow branches strong enough to support the weight of the flowers.

Outdoor then? Depends if you have the space or not or if you’re trying to get most in space with least area. Personally, I give each plant a square meter, but you could do more easily. 2-4 but more than that is pushing it in my opinion. If you can, give em their space