Giant Prickly Pear
Opuntia robusta
An imposing prickly pear with enormous silver-blue pads that creates an unforgettable desert focal point.
Hardy to around 15-20°F, USDA 9-11; excellent low-desert heat tolerance.
AMWUA Notes
Bold water-storing prickly pear that thrives on minimal irrigation.
Care Guide
Needs little supplemental water once established; deep-soak occasionally in extreme drought and avoid keeping the crown wet.
Remove oversized or damaged pads at the joint with tongs and gloves to manage the bold form and spread.
Not necessary.
Cochineal scale is the main pest; remove cottony masses with a water jet.
Fully sun- and heat-loving; the massive silver-blue pads plump after summer rains.
Soil, Feeding & Propagation
Sharp-draining decomposed granite or gritty mineral soil; lean
Needs sharp, fast-draining soil.
Low feeder.
Pads root readily after callusing; also seed
8-10 ft
Shallow, non-invasive roots; keep the large pads clear of paths and pools
Placement Tips
- •Give generous room for the 10 ft spread as a specimen or screen.
- •Keep the large pads clear of paths and pools.
- •Plant in sharp-draining granite.
- •Site as a dramatic focal point.
Features
Best Uses
Companion Plants
Quick Stats
Design Styles
Include in Your Project
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Use this care guide to maintain your Giant Prickly Pear. Questions about your landscape? Reach out anytime.
Data from 2024 AMWUA “Landscape Plants for the Arizona Desert” guide.
Giant Prickly Pear — common questions
Answers for low-desert Phoenix conditions, drawn from this plant’s growing data.
How much water does Giant Prickly Pear need in Phoenix?
Giant Prickly Pear is a low-water cactus once established. Needs little supplemental water once established; deep-soak occasionally in extreme drought and avoid keeping the crown wet. Bold water-storing prickly pear that thrives on minimal irrigation.
How big does Giant Prickly Pear get?
Expect roughly 10 ft tall and 10 ft wide at maturity, with a slow growth rate. Allow about 8-10 ft of spacing when planting. Shallow, non-invasive roots; keep the large pads clear of paths and pools.
Can you plant Giant Prickly Pear near a pool?
Not ideally. Giant Prickly Pear is not rated pool-friendly, so it is better placed away from the pool deck and skimmer. Litter is rated low.
Can Giant Prickly Pear handle Arizona heat and winter frost?
Giant Prickly Pear is hardy in USDA 9-11 and wants full sun. Hardy to around 15-20°F, USDA 9-11; excellent low-desert heat tolerance. Fully sun- and heat-loving; the massive silver-blue pads plump after summer rains.
Does Giant Prickly Pear have thorns?
Yes — Giant Prickly Pear has medium thorns. Site it back from walkways, seating and pool decks where people brush past.
Is Giant Prickly Pear safe around pets?
Giant Prickly Pear is listed as pet-friendly in this guide. If your dog is a determined chewer, check any new plant with your vet before planting.
When does Giant Prickly Pear bloom in Arizona?
Giant Prickly Pear blooms in spring, with yellow flowers.
How much maintenance does Giant Prickly Pear need?
Giant Prickly Pear is low-maintenance. Leaf, flower and pod litter is rated low. Remove oversized or damaged pads at the joint with tongs and gloves to manage the bold form and spread.
What kind of soil does Giant Prickly Pear need?
Sharp-draining decomposed granite or gritty mineral soil; lean. Nutrient needs are low. Not necessary.
Is Giant Prickly Pear native to Arizona?
No. Giant Prickly Pear is not an Arizona native; it originates from the Central Mexico, but it is grown successfully in low-desert landscapes here.