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Echinocereus triglochidiatus

Claret Cup Cactus

Overview

Echinocereus triglochidiatus, commonly known as the claret cup cactus or kingcup cactus, is a highly cold-tolerant and visually spectacular member of the Cactaceae family 1. This succulent subshrub is renowned for its brilliant scarlet, cup-shaped blooms that appear in late spring, making it a highly prized specimen for xeric gardens and rockeries 2.

Taxonomy and Naming

Described in 1848 by the botanist George Engelmann, the specific epithet triglochidiatus is derived from Greek, meaning "three-barbed" or "three-spined," referring to the typical arrangement of its spines 1. The genus name Echinocereus combines the Greek "echinos" (hedgehog) with the Latin "cereus" (wax candle).

Natural Distribution and Habitat

This species is native to the Southwestern United States—ranging from Utah and Nevada to New Mexico and California—and Northern Mexico 2. It thrives in arid deserts, rocky slopes, and pinyon-juniper woodlands, often at high elevations up to 3,000 meters, showing outstanding adaptability.

Appearance

The plant forms dense, mounding clumps of cylindrical stems that reach 10–30 cm in height. The stems feature pronounced ribs lined with aeroles bearing sharp, rigid spines. Its striking, hummingbird-pollinated claret-red flowers are funnelform and remain open both day and night.

Cultivation and Care

In cultivation, Echinocereus triglochidiatus requires full sun exposure and an exceptionally well-draining, mineral-dominant potting substrate. Watering should follow a soak-and-dry cycle during spring and summer, tapering off completely during the cold winter dormancy 3. It is extremely frost-hardy, tolerating temperatures down to -23°C if kept dry.

Common Care Mistakes

The most prevalent issue in cultivation is overwatering, especially during winter dormancy, which quickly induces root rot 3. Insufficient light exposure leads to etiolation (stretching) of the stems and severely limits the plant's ability to produce its signature vibrant blooms.

References

  1. Engelmann, G. (1848). Botanical Appendix to Wislizenus Report. ↩
  2. Benson, L. (1982). The Cacti of the United States and Canada. Stanford University Press. ↩
  3. Pilbeam, J. (1997). The Cactus File Handbook: Echinocereus. ↩
Light

Full Sun

Requires at least 6-8 hours of direct sunlight daily; full sun is crucial for optimal growth and flowering.

Watering

10-30 Days

Water deeply only when soil is bone dry in summer; suspend watering completely throughout winter.

Soil

Highly porous, mineral-rich cactus soil mix with pumice and coarse river sand

Use an ultra-draining, highly mineralized soil mix rich in pumice, gravel, and coarse sand.

Safety

Pet Friendly

Non-toxic to pets, but possesses sharp, rigid spines that can cause physical injury; handle with care.

Difficulty

Easy

Extremely cold-hardy and drought-tolerant, making it a very low-maintenance and easy-to-grow desert cactus.

Native Habitat

Southwestern USA and Northern Mexico

Naturally distributed across the arid mountainous regions, rocky slopes, and pinyon-juniper woodlands of Utah, Nevada, New Mexico, California, and Northern Mexico.

Frequently Asked Questions

How often should I water Echinocereus triglochidiatus?
Water only when the soil is completely dry during summer (roughly every 10 days). Stop watering entirely in winter.
Can this cactus be grown indoors?
Yes, but it requires very high light. It does best directly in front of a south-facing, sunny window.
What type of soil does the Claret Cup Cactus prefer?
It prefers a mineral-based cactus mix containing plenty of pumice, lava rock, and coarse sand for excellent drainage.
How do I get it to bloom?
Provide a cold (around 0-10°C) and completely dry winter dormancy, which is necessary to trigger spring buds.
Is Echinocereus triglochidiatus frost-hardy?
Yes, it is exceptionally cold-hardy and can tolerate severe frosts down to -23°C (-10°F) if kept dry.
What is its growth rate?
It has a slow to moderate growth rate, gradually producing offsets over the years to form large, dense mounds.
Is it toxic to pets?
It is chemically non-toxic, but the rigid, sharp spines present a physical hazard to curious pets.
When should I repot this cactus?
Repotting is typically done every 2-3 years in early spring when the plant starts outgrowing its container.
Why is my cactus getting soft?
Softness in the stem is usually a sign of root rot caused by overwatering or poorly draining soil.
What fertilizer should I use?
Apply a diluted, low-nitrogen, high-potassium cactus fertilizer once or twice during the active spring and summer growth.