Flowers, trees and plants
Just as the APN category describes, all plants and their parts belong here.
What doesn't belong here are cut flowers and arrangements - they have still life category for it.
And although many think it's arguable, we don't accept dead flowers here.
General rule for the entire group's gallery is to avoid man made substrata and people in the image. Person holding a flower belongs to people and portraits, and concrete walls, furniture, cars etc are not something we wish to see in Nature club.