Boy do they grow like weeds. I'm attempting for first year to overwinter 2. One, Picasso's Paintbrush, I occasionally trim the top back but I'm seeing the roots starting to push through the bottom of the pot. Nothing major yet, and I hope during the winter, IF it survives, it will slow.
Question, if necessary, can these plants be gently rootpruned? Gently means not hacking away inches, just ... some? I have nowhere near the energy yet to even consider this more, but I have been wondering.
Thanks for any responses!!!