On 14/05/2014 11:32, P Jameson wrote:
Got one of those walk in plastic greenhouses. The floor is just earth and
so I've got a few one and half foot square plywood boards to put down as a
flooring.

Cheap and nasty concrete flagstones would be much more sensible.

Will they last well enough to just lie down straight on the soil or should I
put some plastic sheeting underneath, so they might last longer and not rot
from the damp?

Either way they will rot pretty fast.

--
Regards,
Martin Brown