In article , Peter Sutton
writes
Everyone knows that you can overwinter Dahlias as a tuber. Today I have just
dug up Salvia patens, which I understand can be treated the same way. And so
can Verbena rigida I believe. Any suggestions of others. And is it critical
exactly when you do it. And what about bare root perennials - you see a lot
for sale. Is that the same thing?




I overwinter salvias and verbena , but in the ground, i.e. I leave them
alone, though sometimes I mulch a particularly nice salvia. All the
dahlias apart from the giant Japanese one that I grew in 2006, came
through last winter.

I'll leave 'after Eight' in the ground and possibly put Turkish Sunshine
(as it's in a pot) in the greenhouse. I have NEVER been able to winter
dahlias out of the ground in spite of following every step advised. They
just seem to rot.
--
Janet Tweedy
Dalmatian Telegraph
http://www.lancedal.demon.co.uk