Back in the days of garment sewing, I discovered selvages were great for stabilizing shoulder seams and neck edges.
Tying up tomato plants sounds like a very good use.
My stash is older fabric, no longer in production, no need to save the selvage for ID. Besides, when I run out, I like the challenge to find a new solution that increases the design of the project.
Only in the last 4-5 years have I been saving them again. They've added up quick. Maybe they'd make a great tote cover for my machine. Then just get a folding hand cart. Solves 2 challenges.
What projects have you seen made from them?