In message , 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?

I suspect you mean Lathyrus latifolius (I know it as everlasting sweet
pea - the BBC have it as everlasting pea). This doesn't have the strong
scent of Lathyrus odoratus (sweet pea), so if what you have is strongly
scented we need to cogitate further.

--
Stewart Robert Hinsley