Root Barriers in Perennials Bed
Sometimes I feel like all plants are either strugglers or borderline invasive. I have small beds and keeping them balanced, without some plants overpowering others is hard.
I don't mind plants that form a clump which slowly gets bigger, these are perfectly fine and I can divide them every 2-3 years as needed. My problem is with plants that send runners/underground roots and grow a new plant 20-30cm far from the mother plant.
Have you ever try or would you consider using a root barrier in perennial beds? Maybe something as simple as a flexible piece of metal or plastic placed around the plant or to divide the bed in compartments. Or using a buried bottomless pot. I use a buried pot for mint in my herbs bed (with a bottom but the roots grow through the drainage holes anyway, so I think bottom or no bottom doesn't matter too much) and the idea of using a similar solution for some perennials sounds good to me. I could lift the pot and divide/thin the plant as needed, without disturbing plants or bulbs around. What do you think?