Michigan Gardening: What is the most invasive perennial in your garden......., 1 by BloomsWithaView

BloomsWithaView wrote:
Never thought this lovely pink thing would be a menace... but it now OWNS one bed of perennials and seems on it's way to drowning all the other plants. It's Oenethera aka Mexican evenig primrose - I bought the one plant labeled 'Siskiyou'. as they say - 'the rest is history'

My other invasive is vinca major. It simply continues its slow advance across the south perennial bed and then sneaks a runner half the width and up pops a new colony.