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Opuntia robusta (Wheel Cactus)

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Scientific Name

Opuntia robusta H. L. Wendl. ex Pfeiff.

Common Names

Wheel Cactus, Giant Prickly Pear Cactus, Wheel Pear, Silver Dollar, Silver Dollar Cactus, Silver Dollar Prickly Pear, Dinner Plate Cactus, Sweet Purple Cactus

Synonyms

Opuntia camuessa, Opuntia gorda, Opuntia guerrana, Opuntia larreyi

Scientific Classification

Family: Cactaceae
Subfamily: Opuntioideae
Tribe: Opuntieae
Genus: Opuntia

Description

Opuntia robusta is a shrubby perennial cactus, commonly up to 40 inches (1 m), but occasionally up to 10 feet (3 m) tall and up to 10 feet (3 m) across. The main stems are much branched and the flattened stem segments (pads) are fleshy, round and blue-green to blue-grey in color, up to 12 inches (30 cm) in diameter and have sharp spines up to 2 inches (5 cm) long. The yellow, bowl-shaped flowers are up to 3 inches (7.5 cm) in diameter and are produced on the edges of the upper stem segments. The barrel-shaped fleshy fruits are pink or purple and up to 3.2 inches (8 cm) long.

Hardiness

USDA hardiness zones 9a to 11b: from 20 °F (−6.7 °C) to 50 °F (+10 °C).

How to Grow and Care

Though the large variety of species within the Opuntia genus means different types of Prickly Pears may need slightly different care. All are desert cacti that need lots of sun, lots of light and very little water. If you live in a hot, arid area, these plants can generally be planted outside, left alone, and enjoyed.

These cacti will grow just fine in a garden, bu they can be grown in pots as well. To repot, ensure the soil is dry, then remove the pot and knock away the old soil. After treating any cuts with fungicide, place the cactus in a new pot and backfill it with potting soil. As with a new cutting, make sure not to water a newly repotting Prickly Pear for a brief period to avoid rotting its roots.

Opuntia can propagate either by cuttings or by seed. To propagate by cuttings, sever pads from a plant and let them dry so that the wounds heal. Then place the plants in a dry soil and refrain from watering them until they begin to grow to avoid rotting them… – See more at: How to Grow and Care for Opuntia

Origin

Opuntia robusta is native and endemic to Mexico.

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