WALNUT GRAFTING TECHNIQUE! Follow Daniele Greenworld ! Walnut split grafting is a common technique used to propagate walnut trees, particularly when joining a scion (desired variety) onto a rootstock. This method is effective for walnuts because they are notoriously difficult to graft due to their high sap flow and sensitivity to environmental conditions. Steps for Walnut Split Grafting 1. Timing: Best done in late winter to early spring (February to April) when the rootstock is still dormant bu