These plants can be grown nearly anywhere with temperatures no lower than twenty degrees of frost; but with zero temperatures protection should be given, or the plants grown in rock gardens in sunny conservatories. They grow easily from seed in sandy or gravelly clay loam soil with partial shade and enough irrigation to keep the soil moist. Plants transplant readily to rocky or gravelly clay soils at almost any season, if the thick fleshy roots are not injured in digging. Water moderately once a month, and where convenient set plants among rocks. Recurved Spine Pincushion; Bent Spine Pincushion (_Coryphantha recurvata_) (Named _recurvata_ from the spines, which are bent down against the plant) How to identify and how it grows The Recurved Spine Pincushion grows in clumps about three feet across, sometimes less, and has several stems four to eight inches long, which are globose, that is, longer than broad. These stems bear twenty-seven or so spirally arranged rows on which appear the angled tubercles. These rows or ridges also have the twenty-five radially grouped spines and one light yellow or translucent grayish yellow central spine. This arrangement of the spines forms a dense impenetrable mass or layer over the surface of the plant. The flowers are about the length of a walnut and have lemon-yellow petals and brown sepals. The fruit is quite small and is light yellow-green. This species differs from the others of the group in that the flowers are borne in a circle two or three inches in diameter about the center of the plant. How to grow These plants will endure twenty degrees of frost without injury; where the winters are colder than this the plants should be covered or grown indoors, preferably under glass. They may be grown from seed in sandy soil or sandy loam in pots with partial shade and with enough watering to keep the soil moist. Field plants may be transplanted at almost any season in gravelly or clay loam soils and given enough water to moisten the soil during dry spells. Devil’s Pincushion; Pineapple Cactus (_Coryphantha robustispina_) How to identify and how it grows