Cactus · Sonoran native
Santa Rita prickly pear
Opuntia santa-rita · Cactaceae
Also called: Purple prickly pear, Violet prickly pear, Opuntia violacea var. santa-rita
Santa Rita prickly pear (Opuntia santa-rita) is a very low-water cactus native to the Sonoran Desert region well suited to Tucson and the low desert. It thrives in full sun.
Santa Rita prickly pear at a glance
- Water use
- Very Low (established)
- Sun
- Full sun. Best purple/violet pad color develops in full all-day sun and is intensified by cold and drought stress; too much shade keeps pads green.
- Mature size
- Typically 3-5 ft tall and 4-6 ft wide; forms a clump of round, blue-purple pads.
- Growth rate
- Slow to moderate.
- Bloom
- Yellow flowers, sometimes aging orange; pads are blue-gray to lavender-purple, deepest in winter cold and drought, Spring (April-May).
- Cold hardiness
- Cold-hardy in Tucson; tolerates the low desert's winter lows (hardy to roughly 0-10°F) with no frost protection. Heat- and drought-tolerant to extreme.
- Soil
- Lean, gritty, fast-draining native or decomposed-granite soil. Tolerates rocky, poor, alkaline desert soils. Avoid heavy clay or irrigated turf areas.
- Native range
- Native to the Sonoran and Chihuahuan deserts of southern Arizona (including the Santa Rita Mountains near Tucson), southern New Mexico, and northern Mexico.
- Best used as
- Accent/specimen cactus, Xeriscape and desert landscaping, Color contrast (purple pads, yellow flowers), Barrier/security planting, Pollinator garden, Rock gardens
- Wildlife
- Flowers attract native bees and other pollinators; fruit (tunas) and pads are eaten by birds, javelina, rabbits, and other desert wildlife.
- Toxicity
- Not chemically toxic, but pads bear fine, barbed glochids (and some spines) that lodge painfully in skin; site away from walkways, play areas, and pet traffic.
How to grow Santa Rita prickly pear in Tucson & the low desert
Watering
Needs no supplemental irrigation once established; water deeply only once or twice monthly during the hottest, driest months to keep pads plump. Excess water plus poor drainage causes rot and weak green growth.
Fertilizer & nutrients
Generally needs no fertilizer in native desert soil. If desired, one light spring feeding with a low-nitrogen cactus fertilizer is plenty; high nitrogen produces weak, overly green growth and dulls the purple color.
Pruning & care
Minimal. Remove damaged, diseased, or wayward pads at the joint (wear thick gloves and use tongs because of glochids). Pads root easily for propagation.
Notes
A signature Sonoran Desert landscape cactus and true Arizona native. Prized for striking blue-purple pads that turn most vivid in winter cold and drought (a stress response, so lean conditions are ideal). Plant in spring or fall. Handle only with thick leather gloves and tongs; remove embedded glochids with tape or a peeled coat of white glue. Botanically often listed as Opuntia violacea var. santa-rita.
Sources: Arizona-Sonora Desert Museum; University of Arizona Cooperative Extension / Pima County Master Gardeners; AMWUA Landscape Plant List; SEINet / Arizona flora references