Zantedeschia valida is a deciduous, robust plant, up to 0.75 m tall and has broad leaves that could be plain or very speckled with white spots. Flowers are exceptionally large. The spathe of the flower is a cup-shaped funnel and dark purple at the base within and can be up to 15cm long. They flower from October to March with the peak in November. This must rate as one of the most beautiful arum species.
The species is restricted to a small region in KwaZulu-Natal. Plants grow among rocks on the mountains in clefts and on foothills, as well as on the banks of streams and in vleis.