Should a Compost Bin Have a Bottom

If you’re building your compost bin from scratch, you don’t usually need to add a bottom to it. Having composting materials sit directly on soil allows microorganisms, worms and insects — creatures that facilitate the composting process — to move from soil into compost.

What do I put at the bottom of my compost bin?

Greens are grasses, fresh leaves and weeds, and vegetable and fruit kitchen scraps. Almost everyone advises putting down a layer of coarse material — corn cobs and husks, sticks, thick fibrous stalks from vegetables or tall flowers. This layer improves aeration at the bottom of the compost pile.

Does compost need drainage?

Drainage is important in a properly functioning compost pile because too much moisture displaces the air the various bacteria that do the most to digest the material need to function.