Very healthy plants. Thinned, yes... unless you are just growing them for the flowers. ;-) The best time to thin them is during the period between frost killing the tops, and new sprouts emerging - when you can eat anything not replanted. You can still separate them now, though, they are pretty tough to kill (even intentionally).

I have them growing wild, and also a named cultivar. The wild ones grow just about that thickly on their own...but in the places where they grow farther apart, the tubers get about 25% larger. It won't hurt them to leave them, and replant farther apart in the Fall when you harvest.

Thanks for the information. So thinning when it comes harvest time.

Would it be a bad thing if I just cut down a few? Or would that cause the attached tubers to rot?

I planted 4 tubers last year and harvested a good bit or at least I thought so, but by the looks I had many more tubers left.

I have areas where I mow them regularly as they are encroaching into my lawn, and the tubers don't rot..just keep sprouting...so I don't believe cutting a few would cause them to rot. You may cause the opposite of what you want, though...in my experience cutting them causes them to sprout more.

Hi Donna,

Thanks for the additional info. I don't want more to come up so I will leave these alone and see how they do. I will heavily harvest in the fall and spread them out further apart with the ones I leave in ground.