Arizona Queen of the Night, Deer Horn Cactus, Reina de la Noche, Night Blooming Cereus

Peniocereus greggii var. transmontanus

Family: Cactaceae (kak-TAY-see-ee) (Info)
Genus: Peniocereus (pen-ee-oh-KER-ee-us) (Info)
Species: greggii var. transmontanus
Synonym:Cereus greggii var. transmontanus
Synonym:Peniocereus greggii var. transmontanum
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Cactus and Succulents

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Flowers are fragrant

Water Requirements:

Drought-tolerant; suitable for xeriscaping

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


12-18 in. (30-45 cm)

18-24 in. (45-60 cm)

24-36 in. (60-90 cm)

36-48 in. (90-120 cm)

4-6 ft. (1.2-1.8 m)

6-8 ft. (1.8-2.4 m)

8-10 ft. (2.4-3 m)


6-9 in. (15-22 cm)

9-12 in. (22-30 cm)

12-15 in. (30-38 cm)

15-18 in. (38-45 cm)


USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

USDA Zone 10a: to -1.1 C (30 F)

USDA Zone 10b: to 1.7 C (35 F)

Sun Exposure:

Full Sun

Sun to Partial Shade

Light Shade


Plant has spines or sharp edges; use extreme caution when handling

Bloom Color:

White/Near White

Bloom Time:

Late Spring/Early Summer

Mid Summer



Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:


Propagation Methods:

From woody stem cuttings

Allow cut surface to callous over before planting

From seed; direct sow after last frost

Seed Collecting:

Allow unblemished fruit to ripen; clean and dry seeds

Unblemished fruit must be significantly overripe before harvesting seed; clean and dry seeds

Properly cleaned, seed can be successfully stored


This plant has been said to grow in the following regions:

Ajo, Arizona

Green Valley, Arizona

Maricopa, Arizona

Phoenix, Arizona

Tucson, Arizona (2 reports)

Wellton, Arizona

Bostonia, California

Buckingham, Pennsylvania

Terlingua, Texas

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Gardeners' Notes:


On Oct 6, 2004, Xenomorf from Valley of the Sun, AZ (Zone 9b) wrote:

This variety has flowers that are 3 inches across and is found in the Sonoran desert below 3300 ft.
Also can be grown from seed. I've seen these growing wild in Oro Valley, AZ & on the 'El Camino Del Diablo Trail' (Devils' Highway) that runs between Ajo and Wellton, Arizona in the Cabeza Prieta National Wildlife Refuge.