When is the best time of year to prune a black walnut tree in mn.?

The best time to prune a black walnut tree in Minnesota is late winter to early spring, ideally between late February and early April, before new growth begins. This timing helps minimize stress on the tree and reduces the risk of disease. Avoid pruning in late summer or fall, as this can encourage new growth that may not harden off before winter. Always ensure to use clean, sharp tools for the best results.