Any reason I shouldn't do a concrete floor?

[Guest]

Building our first greenhouse. Any reason I shouldn't do a concrete floor? We will install a drain..

[Brenda]

Why spend the money on concrete? Let the run off water go back into the soil. For my greenhouse, I first put down cardboard and then wood chips. It has held up and no weeds. I believe I spilled some seeds so I do have flowers coming up. Easy to pull out but the bees like them.

[Scott]

Concrete floor =Permanent structure
PS are taxable temporary ones are not