The Puang Yok devil’s fig is 1-2 meters tall thorn bush. It has small and smooth round green fruit, about 1 cm diameter. It turns red at maturity, which is approximately 120 days after sowing.

Solanum torvum (devil’s fig) is a bushy perennial plant used horticulturally as a rootstock for eggplant. Grafted plants are very vigorous and tolerate diseases affecting the root system, thus allowing the crop to continue for a second year. It is usually 2 or 3 m in height and 2 cm in basal diameter, but may reach 5m in height and 8 cm in basal diameter. The shrub usually has a single stem at ground level, but it may branch on the lower stem. The stem bark is gray and nearly smooth with raised lenticels. The inner bark has a green layer over an ivory color. The petioles are 1 to 6 cm long and the blades are 7 to 23 by 5 to 18 cm and covered with short hairs. The flowers are white, tubular with 5 pointed lobes, and grouped in corymbiform cymes. They are shed soon after opening. The fruits are berries that are yellow when fully ripe. They are thin-fleshed and contain numerous flat, round, brown seeds.