Stones stay warm after the sun goes down.
I have places to sit in my wall which are cozy on cool evenings. Sedums and succulents appreciate the warmth and good drainage of a stone wall.
My most interesting type of tiny plant in the wall is tucked in a safe spot behind a seat where I can sit next to it to care for it and enjoy it.

This is Orostachys malacphylla var. iwarenge. I call it by an easier name, Chinese Dunce Cap. It gets that name because its fall blooms are on tall cones.

I love the gray rosettes against the gray stones. This plant needs full sun and perfect drainage. You will want to sit near it while it blooms. The cones are complex and beautiful.

FLOWER

The last picture puts it nicely in context
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Thanks Knight
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