In article , Ian Waddell
writes
Hi, I'm growing some perennial sweet peas from seed. A few are now 3-4
inches high and starting to lean over. I have put the tallest 3 plants in a
large pot with a cane to support them. However, the stems look rather thin
compared to the annual varieties.
Has anyone grown these from seed and have any tips for me?

I've heard they are terribly invasive ... and so perhaps caution might
be a good tip! Can anyone confirm?
--
Chris