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Cylindropuntia whipplei

Whipple Cholla

Overview

Cylindropuntia whipplei, commonly known as Whipple Cholla, is an exceptionally cold-hardy, shrubby cylindrical cactus belonging to the family Cactaceae. Known for its dense armature of shimmering spines, it is a prominent feature of high-desert xeriscapes 1.

Taxonomy and Naming

Named in honor of Lieutenant Amiel Weeks Whipple, a railroad surveyor and explorer, the species was formally classified under the genus Cylindropuntia. Its common names include Whipple's Cholla and Valley Cholla 2.

Distribution and Habitat

This species is native to the southwestern United States, spanning Colorado, Utah, Arizona, New Mexico, and Nevada 1. It thrives at elevations ranging from 900 to 2,400 meters, typically found in dry grasslands, desert shrublands, and juniper-pinyon woodlands 3.

Appearance

Whipple Cholla forms a low, densely branched shrub up to 1.5 meters tall. Its green to yellow-green stems are cylindrical and segmented, covered in prominent tubercles. The spines are covered with papery, silver-white or pale yellow sheaths that reflect intense sunlight. Chartreuse to yellow-green flowers bloom in early summer, followed by yellow, fleshy, persistent fruits 3.

Cultivation

This cactus requires full sun exposure and exceedingly well-drained, mineral-heavy soils. It is remarkably frost-hardy, surviving temperatures down to -25°C if kept dry. Watering should be sparse in summer and withheld almost entirely in winter 2.

Common Cultivation Mistakes

The most prevalent error is overwatering or using compacted, clay-rich soil, which inevitably leads to root rot. Insufficient sunlight results in weak, etiolated stem segments and sparse spine growth 1.

References

  1. Plants of the World Online (POWO), Royal Botanic Gardens, Kew. ↩
  2. GBIF Secretariat (2023). Cylindropuntia whipplei Taxonomic Backbone. ↩
  3. Benson, L. (1982). The Cacti of the United States and Canada. Stanford University Press. ↩
Light

Full Sun

Requires full, direct sun for robust spine development and flowering.

Watering

14-45 Days

Allow soil to dry out completely. Suspend watering almost entirely in winter.

Soil

Highly well-draining coarse sand and gravel cactus soil mix

Exclusively gritty, mineral-based cactus mix containing pumice, sand, and gravel.

Safety

Contact/Ingestion Risk

Equipped with sharp spines and micro-barbed glochids. Handle only with heavy-duty tongs or thick leather gloves.

Difficulty

Moderate

Very hardy against cold and drought, but highly susceptible to overwatering.

Native Habitat

North America (USA)

Widely distributed across the high deserts of the Southwestern United States, particularly abundant in the Colorado Plateau regions of Arizona, Utah, and western Colorado.

Frequently Asked Questions

Can Cylindropuntia whipplei be grown indoors?
No, it is very difficult to grow indoors due to its high light and UV requirements. It should be kept outdoors on terraces or gardens in full sun.
How often should Whipple Cholla be watered?
Water only when the soil is completely dry in summer (about every 10-14 days), and suspend watering almost entirely during the winter.
What type of soil is suitable for this cactus?
Porous and well-draining cactus soils with high mineral content, mixed with river sand, lava rock, and pumice, are ideal.
Is Whipple Cholla cold hardy?
Yes, this species is extremely frost-resistant, tolerating temperatures down to -25°C (approx. -13°F) provided the soil remains dry.
When should I repot Whipple Cholla?
Repot every 2-3 years in early spring, depending on its growth rate, using heavy-duty gloves or tongs to handle the spiny stems.
Is it toxic to pets?
It does not contain toxic chemicals, but its sharp spines and barbed glochids can embed in paws and mouths, causing severe irritation.
When does it bloom?
It produces yellow-green flowers typically from late spring to early summer. A dry, cool winter dormancy is essential to trigger blooming.
What is its growth rate?
It has a moderate growth rate compared to other desert cacti. Under optimal conditions, it adds several new stem segments each year.
What should be done in case of spine injury?
If small barbed spines (glochids) get embedded in the skin, remove them promptly using tweezers or adhesive tape, then wash the area with soapy water.
How is it propagated from cuttings?
In spring, sever a healthy stem segment, let the cut end callus for a few days, and then plant it directly into dry, sandy soil.