https://forums.botanicalgarden.ubc.ca/threads/very-invasive-plant-list-maybe.22503/
Very Invasive Plant (List...maybe?) | UBC Botanical Garden Forums
MALVA has my vote. Nice for two years, then look out. Its seedlings come up everywhere on every piece of un-mulched soil, ruining perennial beds with...
invasive plant listubc botanical gardenmaybeforums