Sorry - I didn't say. I'm in South Gloucestershire.
Last year's summer hanging baskets lasted until the first week in December.
We are in an open area rather than a built up one - just open farmland
behind the house, but fairly high up.

Jayne

"Jim W" wrote in message
news:1fv0n0d.151rfyv13p1i2oN% Technically anytime in the UK;-)

But generally, Oct - Dec..

Best suggestion is to ask other gardeners local to your
area/microclimate. Where abouts are you?
//
J