In article , Nick Maclaren
writes

Searching the Web indicates that it is globally self-sterile, because
its pollen is non-viable (I can't remember if it doesn't germinate, or
germinates and fails to reach the ovary).

Ah well at least one of the plants I saw last year had seeds.
I did get three seeds from an early set pod (with permission) but they
didn't germinate. Waterperry's was too near the restaurant door to even
think of taking a pod
Not that I would of course, without first asking!

--
Janet Tweedy
Dalmatian Telegraph
http://www.lancedal.demon.co.uk