I want to put a flower bed under the 12" overhang on the north side of
my garage. The ground is probably kind of alkaline because it will be
up against a new concrete slab. I have a bunch of compost I can mix in.

I'm not really wild about hostas.

Some kind of ferns? Caladiums? Peppermint? (not sure peppermint is a
good idea) Nicotiana? Wax begonias? Frilly red leaf lettuce? Impatiens?

Thanks, and best regards,
Bob