This is really for the garden, but help re use and recycle shower curtain rings. Mine are plastic rings with a catch to attach them to the curtain. I use spares to loop around cimbing roses etc to keep them in place. They are easily moved or removed, and dont hurt the stems
I also use strips cut from stockings or pantyhose to tie more delicate plants to supports. Just cut across the leg and you have a flexible SOFT tie, which can be easily adjusted or removed. Make longer ties by looping the rings together.