General Plant Information (Edit)
Plant Habit: Cactus/Succulent
Life cycle: Perennial
Sun Requirements: Full Sun
Full Sun to Partial Shade
Water Preferences: Dry Mesic
Minimum cold hardiness: Zone 9b -3.9 °C (25 °F) to -1.1 °C (30 °F)
Plant Height: 2 feet
Fruit: Pops open explosively when ripe
Flowers: Other: In the genus Euphorbia, the flowers are reduced in size and aggregated into a cluster of flowers called a cyathium (plural cyathia). This feature is present in every species of the genus Euphorbia but nowhere else in the plant kingdom.
Flower Color: Green
Purple
Red
Bloom Size: Under 1"
Underground structures: Taproot
Suitable Locations: Xeriscapic
Uses: Provides winter interest
Will Naturalize
Dynamic Accumulator: B (Boron)
Resistances: Deer Resistant
Drought tolerant
Toxicity: Other: All members of the genus Euphorbia produce a milky sap called latex that is toxic and can range from a mild irritant to very poisonous.
Propagation: Other methods: Offsets
Containers: Suitable in 3 gallon or larger
Needs excellent drainage in pots
Miscellaneous: Tolerates poor soil

Image
Common names
  • Euphorbia
  • African Milk-Barrel

Photo Gallery
Location: Baja California
Date: 2020-03-12
Female, late winter
Location: Baja California
Date: 2016-02-19
E. polygona x anoplia male
Location: Baja California
Date: 2018-01-14
Location: Baja California
Date: 2023-03-02
Female
Location: Baja California
Date: 2018-10-11
Location: Baja California
Date: 2017-06-10
Female
Location: Baja California
Date: 2021-06-06
Spines are sterile peduncles
Location: Baja California
Date: 2023-03-02
Female
Location: Baja California
Date: 2020-01-07
3 gallon (10 inch) pot
Location: Baja California
Date: 2018-12-24
8 inch pot
Location: in my house, Falls Church, VA
Date: 2016-08-07
Uploaded by gasrocks
Location: Baja California
Date: 2016-09-20
Female
Location: Baja California
Date: 2013-08-15
Location: Baja California
Date: 2018-04-17
Female with fruit
Location: Baja California
Date: 2023-05-27
Rooted cutting
Location: Baja California
Date: 2011-11-06
Location: Baja California
Date: 2018-04-17
Location: Baja California
Date: 2018-04-17
Female with fruit
Location: Baja California
Date: 2014-05-20
Location: Huntington Gardens, San Marino
Date: 2014-06-06
Location: Royal Botanic Gardens, Kew
Location: Los Angeles Arboretum, Arcadia, California
Date: 2015-03-07
Location: Baja California
Date: 2020-10-16
Reproduction via branching underground stems
Location: Baja California
Date: 2017-08-09
Singular female cyathium on a male plant, presumably self-pollina
Uploaded by ljones26
Location: Baja California
Date: 2016-02-19
Location: Baja California
Date: 2020-09-21
Minutely pubescent fruit
Location: Baja California
Date: 2018-06-28
Location: Los Angeles Arboretum, Arcadia, California
Date: 2014-04-05
Location: Baja California
Date: 2017-07-17
Male
Uploaded by jmorth
Location: UC Berkeley Botanical Gardens
Date: 2008-11-06
Location: Holmes Beach FL
Date: 2015-04-09
Location: UC Berkeley Botanical Gardens
Date: 2008-11-06
Location: UC Berkeley Botanical Gardens
Date: 2008-11-06
Location: Botanical Garden Meise (Belgium)
Date: 2017-02-27
Location: Botanical Garden Meise (Belgium)
Date: 2017-02-27
Location: MOBOT -   St Louis
Date: 2013-02-27
Location: Missouri Botanical Garden (Mobot) in St Louis
Date: 2016-06-18
Location: Missouri Botanical Garden (Mobot) in St Louis
Date: 2016-06-18
Location: Botanic Garden La Concepcion Malaga
Date: 2017-03-07
This plant is tagged in:
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Comments:
  • Posted by Baja_Costero (Baja California - Zone 11b) on Feb 20, 2017 12:15 PM concerning plant:
    This variable South African columnar succulent, which may be globose when young, resembles a cactus. Forms in cultivation tend to offset a lot over time near the base. They are easy, rewarding plants in cultivation given excellent drainage and strong light. They are excellent subjects for photography of the stem and especially the cyathia.

    E. polygona has absorbed E. horrida (green cyathia) and E. anoplia (red cyathia), the latter now a variety. With the merging of E. horrida there are now a number of other varieties associated with E. polygona, trying to account for the natural variability. 12-20 ribs, stems to 5-6 feet tall (usually much less in cultivation). Cyathia are red to dark purple or yellow-green to green, fruit is furry.

    To favor a more solitary growth habit and/or a larger main stem, remove offsets regularly. If propagation is your aim, do this when they are still small (so they're not all packed in together and hard to separate), but after they have grown roots so they are independent when they are separated. Stem cuttings can also be easily rooted. Avoid any contact with the white sap (extreme irritant), and wait a week or more after breaking up a clump to water.

    In my experience these plants vary in their resistance to herbivores. E. polygona var. anoplia is edible to hares but var. polygona is not; hybrids of the two are edible to rodents.
Discussion Threads about this plant
Thread Title Last Reply Replies
Untitled by jmorth Mar 1, 2013 2:40 AM 4
Family history by Baja_Costero May 3, 2018 10:00 PM 0
Family history by Baja_Costero May 3, 2018 10:03 PM 0
Family history by Baja_Costero May 3, 2018 10:06 PM 0

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