Chickweed does not survive winter. Their seeds do. By carefully removing a thin layer of soil from the top of the bed early in the spring, you can eliminate chickweed completely. Thousands of seeds are dropped on the surface of the soil when the plant matures. These seeds survive winter and germinate long after the adult plant is gone. If you follow this technique, chickweeds will be gone within two seasons.
Timing is critical. If any seed pods are visible on a mature plant, remove and dispose of the plant carefully. Seeds can be planted accidentaly during handling. Herbicides are effective only when applied before or during flowering. Timely removal is the best method of control.