Species · genus Opuntia · Cactaceae

Twistspine Pricklypear

Opuntia macrorhiza Engelm.

Also known as: Grassland Pricklypear · Plains Twistspine Pricklypear · Western Prickly Pear · Bigroot Pricky Pear · Prairie Pricklypear

Growth habit

succulent subshrub

Native range

Arizona, Arkansas, Colorado, Illinois, Kansas, Mexico Northeast, Mexico Northwest, Missouri, New Mexico, Oklahoma, Texas, Utah, Wisconsin

Opuntia macrorhiza — reference photo — Patrick Alexander from Las Cruces, NM · CC0

Cultivars of O. macrorhiza

The named forms growers keep — each with its own page, each honest about how much we know.

No named cultivars catalogued under O. macrorhiza yet. When growers document a stable, named form, it earns its own page here.

Guide

The species-level account. Cultivar pages build on this and say where they differ.

A hardy prickly pear

Opuntia macrorhiza is a cactus in the family Cactaceae, part of the pad-forming, spine-bearing Opuntia genus. It carries the synonym Opuntia mackensenii under its accepted name.

Source: RHS

Central and southern plains native

This species' native range runs through the central and southern United States into northern Mexico, taking in states from Arizona and Colorado through to Texas and Wisconsin. It grows as a succulent subshrub, chiefly within the temperate biome, and has also become established outside its native range in parts of Argentina, Germany, and the North Caucasus. It was first described by Engelmann and published in 1850.

Source: Kew

Pads, spines, and flowers

As with others in the Opuntia genus, this plant carries flattened, pad-like stem segments armed with spines and barbed bristles. It produces funnel-shaped flowers that give way to spiny, fleshy fruits, the general form shared across creeping, bushy, or tree-like relatives in the genus.

Source: RHS

Care recipe

The species record — the baseline every cultivar inherits unless it says otherwise.

Care notes are early — not yet verified

Light: ai:claude-opus-4-8
Water: ai:claude-opus-4-8 (range 14-30d)
Humidity: ai:claude-opus-4-8
Soil: ai:claude-fable-5
Care: ai:claude-fable-5

Light

Direct sun

Water

≈ every 30 days

Humidity

Low — average room

Temperature

5–30 °C

Soil mix

Sharp-draining cactus mix with coarse sand and grit

Propagation

Root a callused pad in dry mix

Fertilizing

Dilute low-nitrogen cactus feed once or twice in the growing season

Growth rate

Slow

Flowering

Rarely flowers indoors

ToxicityAuthoritative · species

Not yet documented

This is where toxicity lives — every cultivar of this species inherits it and none can override it.

Reference images

Every image credited. Licenses link to their deeds.

Patrick Alexander from Las Cruces, NM · CC0

Sources: ai:claude-opus-4-8 · ai:claude-opus-4-8 (range 14-30d) · ai:claude-fable-5

Kept true by its growers

Every fact here carries its source. Grow Twistspine Pricklypear yourself? What you’ve observed — how it drinks, how it holds its color, a name that’s off — and a clear photo of your plant are exactly what keep this page honest. Contributions are reviewed before anything changes.