What type of weed is characterized by small white flowers and square stems?

Ground Ivy, also known as creeping Charlie, is characterized by its unique features including small white or purple flowers and square stems. The square-shaped stems are a key characteristic of the mint family, which sets this weed apart from others. Additionally, Ground Ivy often spreads quickly across lawns and can be particularly invasive, thriving in cooler temperatures and shadier areas. Its distinctive growth habit and flower structure make it identifiable compared to the other options, which have different defining traits. For example, common chickweed has star-like white flowers but not square stems, knotweed features a different stem structure and does not have small white flowers, and thistle plants generally have spiny characteristics and larger purple or pink blooms. Understanding these distinguishing characteristics helps in accurate identification and effective management of lawn weeds.