The rat tail cactus is a showy cactus distinctive for its long, trailing stems, which grow to about 4 feet at maturity and give the plant its nickname. Its flowers are tubular and fairly large, about 2 inches wide and flowers in spring and early summer, usually violet-red but sometimes in idiosyncratic colors like pink and orange. There are numerous varieties of the rat tail cactus, some of which have deeply ridged stems, while the parent plant has stems with shallow ridges. This plant is very easy to propagate by cuttings because its stems grow so vigorously.

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Source: The Spruce