yep, to respond to the various questions in this thread:
-i have never had the normal inulin responses that i get from sunchokes or uncured yacon from salsify or scorzonera
-agreed with anne, if you don’t let them flower, they’re definitely not invasive.
-salsify is biennial, so you’d generally harvest before flowering anyway. scorzonera is
perennial, and i’ve liked leaving them in the ground for 4 years or so, so the
roots aren’t too skinny. young flowerbuds are also edible, so it’s possible to let harvesting food keep them from flowering.
-seeds are relatively large, and it’s generally easy to collect all or nearly all of them if you’re in the garden fairly regularly, before they try to go anywhere.