Could the 'tree' possibly be a hazel that has been tortured into having a single stem? (Poor thing if so!)
PS.... where are you?
Sounds like you're doing all the right things, so I think you'll escape trial for first degree murder! Is there any chance you're watering some of them TOO much?
Love this plant! I had a beautiful patch of it for years, then one winter it just died on me. I keep meaning to replant it. Just use gloves when handling.
And welcome to the forum!
Gosh, I'm sooooooooooooo behind schedule! Only done my tomato pots, the rest are empty.
Waz, I'm sure they appreciate it.
Charlie, thank you so much!
Can you post a photo of the curled leaves?
Have sent you PM! Thank you!
Ooo, charlie, foxglove alba yes PLEASE!