I have grown cobaea scandens from seed for the first time this year. Despite reaching about 7 ft tall, it has not produced any flowers, and I presume it's too late now. It's in a large pot on a south facing wall and the thunbergia and ipomaea growing up the same trellis have done fine. Any ideas what I've done wrong?
You've done better than me; my seeds didn't even germinate!
No real idea, but if you have somewhere to overwinter it, you should do better next year.
I grew several of these last year from seed and only one of them flowered.
They were a huge disappointment and I wouldn't bother again.
I wonder if it was too cold early on? I grew mine a few years ago; they were all kept under glass, and all flowered very quickly.
Dad and I grew them for years. Could never get any flowers pre-October. Sarah Raven made me laugh on a GW earlier this year, as she implied they're in flower by now. Not in either Derbyshire or Buckinghamshire, for sure!
moonbells
ps they are best used in my opinion for covering ugly fences with greenery. If they flower, it's a bonus.