I think if all images were hosted not on my infra it would be fine. I am not aware of any laws that forbid sharing information about weed.

But it would need to be heavily moderated. There are already some "trees" communities. Subscribing to them from our instance I wouldn't have a problem with

Edit: position: no, unless we get other moderators and admins we can trust. Currently it's just 2 people doing admin n moderation. Having a community like that may be a lot more involved that I would want to be.