Hi, I dug a load of these out of 1 of my beds last year, I found that if you prune them after flowering, giving them a fairly hard prune, the stems get harder and can support themselves without being tied up, Derek.

Thanks Derek, I'll do that.

Temporary solution would be green garden twine instead of brown. And not tied up so tight - let it spread out a little more.

Thank you urbanite. We only had a choice of brown or bright green string, so the brown won!