"Klara" wrote in message
...


Having googled this, I'm confused: is it a hardy annual or a tender
(Mediterranean) evergreen perennial?
I know it self-seeds, and I've also saved seeds for next spring, but
should I pull the plants up, or cut them down, or might they look
reasonable through the winter in an otherwise bare bed?

--
Klara, Gatwick basin

It's normally treated as an annual and if sown early enough it will reseed
the same year and in mild conditions produce more plants the same year which
if you are lucky will produce a display even in winter.