Have you noticed a small plant with heart-shaped leaves cropping up in your planter beds or lawn? It could be a volunteer redbud tree. Depending on where the seed lands, it might be a welcome visitor, but in most cases you will find yourself digging it out later on. Just like pampas grass, the redbud is not classified as a noxious weed, but given the fact that it ends up in neighbors’ yards and planter beds, it can be a nuisance plant. If you find one of these in a bed or your lawn, and you didn’t plant it, please remove it. Other spreading volunteer plants are Russian Sage, Russian Olive, Siberian Elm and Red Smoke Bush. Avoid expense down the road and take these volunteers out early. Keep in mind that any new plant that will reach over 4 feet at maturity does have to be approved by the DRC.
The following link about the Siberian Elm explains why this volunteer and others like it need to be controlled.
Control of Siberian Elm: https://www.invasive.org/weedcd/pdfs/wow/siberian-elm.pdf
The following photos will give you an idea of what to look for. But it is safe to say that if it is growing in or very close to another plant, it is a volunteer you probably don't want.