The prime season to prune black walnut trees may be winding down with the unseasonably warm temperatures. Routinely pruning during the dormant season in Missouri can extend well into March and possibly longer. This dormant period may not be routine this year.
Van Sambeek, Jerry. 2017. Time pruning to avoid disease - black walnuts. Missouri Chapter News.Feb. 24 (special edition). West Lafayette, IN: Walnut Council, Missouri Chapter. 2 p.