Galvanised sheet metal,and padded with some scraps of thermal insulation.
...Hopefully this will help more of my herbs trough the next winter.
I intend to plant it next weekend with some less-hardy stuff like sage and thyme,
and perhaps top it off with some sedums.

The insulation,and the drainage gutter.
Plenty of shards around to fill the bottom...a couple of my terracotta's froze to bits this winter.

