I have some I started from dollar store bulbs. Mine is in too-small pots right now, but it seems quite persistent. I think it's been discussed on the forum in the past & I believe it was said to have the potential to become invasive in some areas....?

Yes it can. I keep mine in sunken pots to keep the rhizomes restrained. I also started throwing the seedheads into my compost once I finally got it to critical mass.

Also, I think, but could be wrong, this is one of those cases where aggressive rather than invasive is the more applicable term.

I agree - aggressive IS a better term.

Glad to see this distinction. All over the web-and likely everywhere else too-this distinction is being lost on too many. A plant with a rhizomatous root system may act aggressively in terms of colonizing new soil, but if it is native to that area, it is by definition not invasive. Some folks still don't understand what this is all about-the displacing of native plant species and whole plant communities by plants not native to the area in question, not some plant that gets into your other garden plants due to aggressive growth patterns.

+oM