But - I took pity on one scotch bonnet plant in the end. Its leaves weren't all mottled and sick looking like the other plants, so I kept it around.
I did however hack it right back to a stump. Literally. Look:
The leaves you see weren't there when I hacked it. They've grown. And look, green shoots out of the main trunk!
Actually against all odds, I think we might just have a good start for this plant this year. I'm looking forward to the prospect of some good scotch bonnets!
Overwintering, apparently, isn't so hard after all.