I drilled small drainage holes in the bottom of the black container - I will get about 6 inches of dirt in these. The yellow lid goes under that to catch drips. I have clear plastic containers about 7" tall that fits almost perfectly over the black container to make the mini greenhouse.
I have several potted herbs - I'll use one of the black containers to just put the pots in and then cover with the clear plastic container as needed. I can also try using a seed mat underneath the containers when the weather gets below freezing - an experiment for one or two plants to see how it goes.
The size is just right to fit in the spaces I have, and they are sufficiently sturdy, so I'll be ordering a few more to use this winter. I wanted to grow more lettuce this winter than I did last year. I've got some winter density and little gem along with some leafy types and spinach.
