The fruit of the dwarf Ponderosa lemon looks much like that of citron. It bears large, grapefruit sized, pale green fruit with a thick, furrowed rind. While the fruit is juicy, it is extremely acidic. Blooming and fruiting occurs year round. As its name indicates, the tree is small, round at the top with medium sized branches upon which hang large, elliptical leaves. Usually grown as an ornamental, although the fruit can be used in place of lemon, the Ponderosa has purple tinged flowers. Like all lemon trees or hybrids, Ponderosa lemons are very cold sensitive and frost tender. Ponderosa lemon growing should only occur in USDA hardiness zones 9-11 or indoors with additional lighting.