CASFS - Apples Whitewashed tree trunks

CASFS - Apples: "Place the bud union (the point where the scion is budded or grafted onto the rootstock), which appears as a visible swelling, 2'-3' above the soil. The bud union scar should face north or away from the prevailing wind. In hot areas, the trunk should be whitewashed to protect it from sun damage until a canopy of leaves is in place."