Common Chickweed has survived millennia of human irritation by being genuinely useful. Native to Eurasia and North Africa, it followed settlers across the globe and now covers lawns and garden beds from zones 4 through 11, germinating in the cool damp of late winter when almost nothing else stirs. The flowers open each morning and close again after twelve hours, and on overcast days stay shut entirely. The leaves fold inward at night, cradling the new shoot buds in a habit that reads almost protective.

Beyond the weediness, Stellaria media earns a closer look. The stems, leaves, and flowers are all edible, with a mild flavor suited to salads or a quick saute in place of spinach. It hosts caterpillars of several elfin butterfly species including Henry's Elfin and the Hoary Elfin, and its seeds attract songbirds through the hungry months. Where it becomes a serious nuisance in lawns, a preemergent herbicide applied to the label is the most reliable control; where it carpets a rough corner of the garden, consider letting it run until warmth ends it naturally.