Photo by Melody

PlantFiles: Cow's Horn
Euphorbia grandicornis

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Family: Euphorbiaceae (yoo-for-bee-AY-see-ee) (Info)
Genus: Euphorbia (yoo-FOR-bee-uh) (Info)
Species: grandicornis (gran-dih-KOR-nis) (Info)

15 members have or want this plant for trade.

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Category:
Cactus and Succulents

Height:
4-6 ft. (1.2-1.8 m)
6-8 ft. (1.8-2.4 m)
8-10 ft. (2.4-3 m)
10-12 ft. (3-3.6 m)
12-15 ft. (3.6-4.7 m)
15-20 ft. (4.7-6 m)

Spacing:
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)
10-12 ft. (3-3.6 m)

Hardiness:
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)
USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:
Full Sun

Danger:
Handling plant may cause skin irritation or allergic reaction

Bloom Color:
Pale Yellow
Inconspicuous/none

Bloom Time:
Mid Spring
Late Spring/Early Summer

Foliage:
Deciduous
Succulent

Other details:
Drought-tolerant; suitable for xeriscaping

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:
Non-patented

Propagation Methods:
From semi-hardwood cuttings
Allow cut surface to callous over before planting

Seed Collecting:
Unknown - Tell us

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By Happenstance
Thumbnail #1 of Euphorbia grandicornis by Happenstance

By palmbob
Thumbnail #2 of Euphorbia grandicornis by palmbob

By palmbob
Thumbnail #3 of Euphorbia grandicornis by palmbob

By palmbob
Thumbnail #4 of Euphorbia grandicornis by palmbob

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Thumbnail #5 of Euphorbia grandicornis by palmbob

By franj
Thumbnail #6 of Euphorbia grandicornis by franj

By cactus_lover
Thumbnail #7 of Euphorbia grandicornis by cactus_lover

There are a total of 26 photos.
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Profile:

6 positives
2 neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive Baja_Costero On May 17, 2014, Baja_Costero from Baja California
Mexico (Zone 11) wrote:

Well armed, durable Euphorbia. Tends to branch low down instead of growing a tall main trunk. This behavior is especially apparent in seedlings. Very seasonal growth pattern, almost all in spring and summer, but quite fast when given space and water. Nice yellow flowers. Plant may be self fertile.

Neutral Mudbug1960 On Mar 25, 2014, Mudbug1960 from Austin, TX (Zone 8b) wrote:

I had three potted grandis, each 3-4' tall, and each well-rooted for over a year. Austin dropped to 33 degrees on November 14th, cold weather was on the way, so the next day I got my frost-intolerant plants inside, including the grandis. I lost all of them, and the death spiral commenced almost immediately.

Positive Porphyrostachys On Feb 18, 2011, Porphyrostachys from Portland, OR (Zone 8b) wrote:

Just recently noticed that the flowers have a sweet scent similar to that of Narcissus! A plant kept in an enclosed greenhouse had me thinking there was a misplaced flat of bulbs, but as I sniffed around, the culprit turned out to be E. grandicornis!

Positive BayAreaTropics On Sep 22, 2005, BayAreaTropics from Hayward, CA wrote:

Shrubby and makes a great barrier plant. Moderate grower. Buy at the largest size you can-save a decade. The average Bay Area winter is no problem for a in ground plant.

Neutral smiln32 On Nov 30, 2004, smiln32 from Oklahoma City, OK (Zone 7a) wrote:

Upright branching habit to 5-6'. Frost free areas only. Can be cut and kept short or be allowed to grow tall.

Positive cactus_dude On May 13, 2004, cactus_dude from Weslaco, TX (Zone 10a) wrote:

These grow wild here in South Texas. They are also called Zig Zag Cactus. If you have goats or cattle, they will eat this plant on the edges , trying to avoid the spines. It seems the latex doesn't bother or irritate the animals, truely weird!

Positive palmbob On Mar 26, 2004, palmbob from Acton, CA (Zone 8b) wrote:

Common potted and landscape plant in Southern California. Has great angularity and large spines making in a good ornamental choice. Does tend to rot easily if overwatered (found that out). Is not that delicate, though, in terms of brushing up against it and damaging it releasing sap... you have to hit it pretty hard. However, the spines can be quite hazardous, making moving or trimming this plant a chore. Plant can become enormous, often collapsing under its own weight eventually. However, if kept pruned regularly, this can be avoided. Makes tiny leaves in summer where the new growth forms, but usually devoid of leaves all winter. Flowers and fruits in late spring... flowers are actually quite striking and brilliant yellow, but usually on mature plants, and mostly those growing in full sun.

In southern California this is a very slow plant. My 6" tall plant grew into a monster in just 4 years, and now, 2 years later still, is over 12' tall and has (had- I trimmed most away) many gnarled and twisted branches forming an impenetrable wall in just a few years.

Positive Happenstance On Aug 28, 2003, Happenstance from Northern California, CA wrote:

Like all Euphorbia HANDLE WITH CARE, the latex/sap is dangerous and can cause skin rash, itching and general discomfort.

Regional...

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

Grenoble,
Phoenix, Arizona (2 reports)
Clayton, California
Hayward, California
Perris, California
Reseda, California
San Diego, California
San Marino, California
Spring Valley, California
Thousand Oaks, California
Bartow, Florida
Fort Walton Beach, Florida
Andrews, Texas
Weslaco, Texas



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