Wild violets are indeed all but impossible, to weed out entirely, because their hearty, fibrous roots generate a hidden array of seed-bearing capsules. If any of Violet's root is left below, she pushes her way into the garden again, with gusto, soon or next season (growing job security).

Image: Carpet of wild violets, by Calliope/Muffet, via Flickr.com
Throwing caution to the winds, I rescued a few specimens and re-planted them in an ad hoc, non-Zen rock garden I keep outside the back door (officially the fire escape) at the boundary line of the property. I situated the violets in a vacant spot at the end of a line of bamboo that is only just beginning to sprout through and around the rocks.
This is a non-scientific experiment, for fun and a splash of color. My violets might take hold, but they are unlikely to invade anyone else's garden because the surrounding cement will create a rhizome barrier.
I hope a violet-bamboo rhizome war doesn't erupt.
Comments