Lesser celandine is one of our more challenging invasive species to control. It emerges, flowers, and goes dormant in a very short period in early spring. If you have walked along rivers, streams, and flood plains in the springtime, you have likely seen lesser celandine. It is very good at excluding / choking out native perennials and seedlings. It is late December and I saw some emerging along the Scioto river last week, likely encouraged by our recent warm temperatures. I did not apply herbicide this early in the growth cycle, as the timing and the plant's development weren't ready quite yet.