Velvetleaf roots can absorb atrazine over time without breaking it down. The absorption happens in two phases: a quick one followed by a slower, continuous one. The roots accumulate atrazine due to aging, not metabolism. Lower temperatures slow down both absorption and release of atrazine. The roots can release atrazine in two phases, with a slower release happening over several hours. This study shows that velvetleaf roots can hold onto atrazine for a long time through a process that relies on metabolism.