Begonia geranioides is a tuberous, fleshy, often stem-less perennial that grows to about 300 mm tall. The leaves are light green, roundish, heart-shaped (up to 80 x 110 mm), with white hairs and with margins often shallowly and irregularly lobed with blunt teeth. The juvenile leaves are sometimes white-spotted, with veins often pinkish or reddish. The flowering stems are hairy, leaf-less and held above the leaves at about 300 mm and are also pinkish or reddish. The male and female flowers occur separately (unisexual) but are borne on the same individual plant (monoecious) and can self-pollinate to produce viable seeds. The pure white blooms, with a yellowish centre, are borne on pendulous stalks, from December to June. The male flowers generally have four tepals and the female five, and both are about 20-30 mm across. The fruit is three-winged and about 20 x 20 mm across the broadest part of the wings.