"Janet Tweedy" wrote ...
I wanted to try "Ne plus ultra" and Alderman this year. Both very old
varieties.
How far apart would I need to grow them to ensure that if I saved the seed
for next year it wouldn't be a 'mix'?
Or is it not possible at all?

I hope you have better luck than we had with those varieties, we eventually
gave up planting them as the hot dry summers stopped them growing and they
failed to provide peas in any quantity. We only grow early peas now that are
finished before the heat of summer.

--
Regards
Bob H
17mls W. of London.UK