Any idea which plant this is? It grew 3 feet in about a month. At first, I was curious to see what it was, but anything that grows so quickly is usually bad news. Just want to check before eliminating it.
Try Common motherwort (Leonurus cardiaca). These look like the early spring leaves. I grow Chinese Motherwort (Leonurus japonicus) for a pollinator plant, and it readily self-sows. I love it.
Does it have a smell. It looks more like Artemisia vulgaris Mugwort to me. I should have examined the mungwort patch at my community garden more closely. It was slated to be eliminated last saturday.