mark writes
I have some sweet peas which come up every year and I've always referred to
them as 'perennial sweet peas'.

I would like to get some more but can't find them specifically mentioned in
my big gardening book ( the one everyone gets when they join a book club!).

The nearest I could find was 'frost hardy'. Is there a name for such a pea
in common parlance?

Perennial sweet pea, everlasting pea, Lathyrus latifolius
--
Kay