How to prune pistachio 'kerman'

Late winter while dormant, before bud break (February–March). Thin inward-growing, crossing, and downward-growing branches to open the canopy. Head scaffold tips lightly if height control is needed. Remove any dead or diseased wood. Pair with a compatible male pollenizer (e.g., 'Peters') for fruit set.

Annually, light thinning each dormant season. 'Kerman' is the dominant commercial female pistachio cultivar and needs the same moderate annual pruning as the species. Light dormant thinning (10–15% of crown) maintains canopy openness for light and pollinators. Avoid heavy cuts — over-pruning 'Kerman' is well-documented to increase blank (closed-shell) nut rates, reducing commercial and home-orchard yields significantly.

Thin inward-growing, crossing, and downward-growing branches to open the canopy. Head scaffold tips lightly if height control is needed. Remove any dead or diseased wood. Pair with a compatible male pollenizer (e.g., 'Peters') for fruit set.