Rebutia krainziana

This species is thought to have originated in Argentina. It was described in 1948 by the distinguished Swiss horticulturist, Kesselring, according to living specimens purportedly brought to Europe by the German collector of cacti, Ritter. It probably no longer exists in the wild. Like R. senilis, it produces numerous offshoots, so that it soon forms large groups of flattened, spherical stems about 4 cm (1.5 in) across. They are a matte green and the ribs are formed by small tubercles. The large areoles are white, thickly woolly, with 8-12 short, soft, snow-white spines. In spring the plant bears a profusion of bright red flowers with yellowish throats.

No special care is required to grow it indoors. It will grow in ordinary compost with adequate watering. It should be protected from excessively strong sun by light shading. Crossing with other species of Rebutia has yielded cultivars with white blossoms.

Cereus peruvianus ‘Monstrosus’

This species was cultivated as early as 1576, but is no longer to be found in its original habitat. Like all members of the genus Cereus, this plant has a long, columnar stem that may be up to 3 m (10 ft) high in mature specimens. It branches profusely and the young shoots are pale green,, later becoming blue-green. The stem usually has five to eight ribs. The areoles are whitish; four to seven radial spines and one or two central spines grow from them. The flowers, which open at night, are pure white and large – about 16 cm (6 in) long. The tube is usually without scales and glabrous.

Various monstrous forms are often grown indoors. It grows fairly rapidly and so requires fairly nourishing compost. Water liberally and feed regularly in summer. Propagate from stem segments, as well as from seeds, which have good powers of germination.

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