General Plant Information (Edit)
Plant Habit: Cactus/Succulent
Life cycle: Perennial
Sun Requirements: Full Sun
Minimum cold hardiness: Zone 10a -1.1 °C (30 °F) to +1.7 °C (35 °F)
Plant Height: 8 inches
Plant Spread: 12 inches or more
Leaves: Other: Very small and short-lived
Fruit: Pops open explosively when ripe
Fruiting Time: Year Round
Flowers: Showy
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: Yellow
Bloom Size: Under 1"
Flower Time: Year Round
Suitable Locations: Xeriscapic
Dynamic Accumulator: B (Boron)
Resistances: Deer Resistant
Rabbit Resistant
Drought tolerant
Toxicity: Other: All parts of Euphorbias can be toxic. Handle with care.
Propagation: Seeds: Self fertile
Can handle transplanting
Propagation: Other methods: Offsets
Containers: Suitable in 3 gallon or larger
Needs excellent drainage in pots

Common names
  • Medusa's Head
  • Euphorbia

Photo Gallery
Location: Baja California
Date: 2018-06-28
Buds are bright red
Location: Baja California
Date: 2019-08-01
10 inch pot
Location: Baja California
Date: 2019-09-14
With crests and reversions
Location: Baja California
Date: 2019-06-26
Buds, blooms and fruit at the start of summer
Location: Baja California
Date: 2021-04-18
Location: Baja California
Date: 2018-06-05
Location: Arenas Valley, NM My Home
Date: 2018-12-12
Location: Baja California
Date: 2020-02-08
Location: Baja California
Date: 2010-12-26
Location: Baja California
Date: 2019-03-21
At the start of spring
Location: Baja California
Date: 2020-03-12
Both tubercles and arms produce vestigial leaves
Location: Baja California
Date: 2017-08-31
10 inch wide pot, 6 inch tall stem
Location: Baja California
Date: 2012-04-12
Location: Baja California
Date: 2018-06-11
Volunteer seedling, after separation.  Ground level is where the
Location: Baja California
Date: 2021-04-21
Location: Baja California
Date: 2012-04-19
Location: Baja California
Date: 2016-04-23
Location: Baja California
Date: 2014-05-14
Location: Baja California
Date: 2017-07-04
6 inch pot
Location: Baja California
Date: 2013-01-27
Day long sun (southern exposure)
Location: Baja California
Date: 2017-02-23
Location: Baja California
Date: 2017-08-03
Location: Arenas Valley, NM My Home
Date: 2018-12-12
Location: Baja California
Date: 2023-05-27
Recently rooted cutting, purple is a stress color
Location: Baja California
Date: 2020-10-16
Removing an offset
Location: National Botanical Garden (DC) | November 2022
Date: 2022-11-26
Location: Baja California
Date: 2017-05-30
With offsets, cyathia and fruit
Location: Cebe Cottages Transkei Eastern Cape
Date: 2015-06-28
Euphorbia Flanaganii

Date: 2016-02-04
Location: Baja California
Date: 2016-10-17
10.5" pot
Location: Southwest Florida
Date: October 28, 2011
view from the side

Date: 2016-02-04
Location: Baja California
Date: 2016-07-29
Fruit is ready for collection when it turns brown (4 total in ima
Location: Southwest Florida
Date: March 2012
This plant is now blooming for the first time for me.
Location: California Backyard
Date: 2016-07-17
10 Year Old Medusa
Location: Tennessee
Date: 2013-12-26
Location: At our garden - San Joaquin County, CA
Date: 2016-02-18 - Winter
Euphorbia flanaganii this winter Feb 2016
Location: Southwest Florida
Date: October 28, 2011
a very healthy specimen

Date: 2016-02-04

Date: 2016-02-04

Date: 2015-02-09

Photo courtesy of Kevin Morykwas, Steve's Leaves, Inc.
Location: At our garden - San Joaquin County, CA
Date: 2014-06-17
Photo update of my E. flanaganii as of 17June 2014
Uploaded by LAGardengirl
Location: Baja California
Date: 2013-11-29

Date: 2015-02-09

Date: 2015-02-09
Uploaded by tarev

Date: 2015-02-09
Location: Middle Tennessee
Date: 9/21/2010
Recused from a Big Box store on 9/21/2010
Location: Middle Tennessee
Date: 9/9/2011
Rescued plant on 9/9/2011

Date: 2015-02-09

Date: 2015-02-09
Location: In our garden - San Joaquin County, CA
Date: 2016-10-26 - Fall Season
Caudex of Euphorbia flanaganii
This plant is tagged in:

  • Posted by Baja_Costero (Baja California - Zone 11b) on May 8, 2017 9:10 PM concerning plant:
    South African succulent Euphorbia. Probably the most common of the medusoid Euphorbias in cultivation. Like the other ones, it grows a central "head" with many "arms" (the venomous snakes of Greek mythology) radiating outward around it. The stem may grow a few inches high and wide, the total width of the plant up to a foot or more in strong light. Not a great choice for low light situations (the arms grow weak and long, sprawling all over). Yellow flowers. May be self fertile. Easy to grow from offsets or from seed. May blush red in direct sun. Extremely photogenic when grown right.
  • Posted by SongofJoy (Clarksville, TN - Zone 6b) on Sep 10, 2011 4:00 AM concerning plant:
    Don't be afraid to attempt to rehabilitate a Medusa's Head even when it looks bad. Many times the plants have been over-watered and can be salvaged with a little TLC. Always check for root mealies by removing the plant from the pot. Replace the old soil with fresh soil.
Plant Events from our members
mingo1943 On May 13, 2018 Obtained plant
I don't have any event , i just want to buy the plant madusa. How and where can i buy it. I live in Southwest Texas. I had this plant but i think it just walked away.
MySecretIslandGarden On April 28, 2023 Bloomed
MySecretIslandGarden On February 17, 2023 Bloomed
MySecretIslandGarden On July 26, 2022 Bloomed
First bloom for me
» Post your own event for this plant

Discussion Threads about this plant
Thread Title Last Reply Replies
Euphorbia flanaganii by valleylynn Jun 10, 2018 7:43 PM 10
13 rows by Baja_Costero Apr 19, 2021 5:32 PM 0
How do I get one by WebTucker May 28, 2022 6:56 PM 2

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