Photo by Melody

PlantFiles: Castor Oil Plant, Castor Bean Plant
Ricinus communis 'Gibsonii'

Family: Euphorbiaceae (yoo-for-bee-AY-see-ee) (Info)
Genus: Ricinus (RISS-i-nus) (Info)
Species: communis (KOM-yoo-nis) (Info)
Cultivar: Gibsonii

Synonym:Ricinus communis var. gibsonii
Synonym:Ricinus gibsonii

4 members have or want this plant for trade.


Unknown - Tell us

36-48 in. (90-120 cm)

USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)
USDA Zone 10b: to 1.7 C (35 F)
USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:
Full Sun

All parts of plant are poisonous if ingested

Bloom Color:

Bloom Time:
Late Summer/Early Fall

Grown for foliage

Other details:
May be a noxious weed or invasive
Average Water Needs; Water regularly; do not overwater
Self-sows freely; deadhead if you do not want volunteer seedlings next season

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; direct sow after last frost

Seed Collecting:
Bag seedheads to capture ripening seed
Properly cleaned, seed can be successfully stored

Click thumbnail
to view:

By Lala_Jane
Thumbnail #1 of Ricinus communis by Lala_Jane

By vince
Thumbnail #2 of Ricinus communis by vince


1 positive
1 neutral
No negatives

Gardeners' Notes:

Positive griffinpd On Jun 20, 2009, griffinpd from Sherman, TX (Zone 7b) wrote:

The first time I saw this plant I knew that I MUST have it. That moment was definitely a "SEE"! I now have about 20 reds and 20 purples. I use them as a backdrop for my hibiscus plants.

I initially started my seeds inside but soon discovered that the seeds that I sowed straight into the ground soon caught up with the potted plants. (Very close to 100% germination rate) They definitely grow like weeds and go crazy from the water and fertilizer that my hibiscus get.

Neutral berrygirl On Mar 5, 2007, berrygirl from Braselton, GA (Zone 7b) wrote:

Introduced into English gardens in the 16th century. Stately quick-growing ornamental plant with tropical appearance, large reddish-tinged foliage and brightly colored seedpods, a real head-turner. Listed in 1896 catalog of R & J Farquhar along with 10 other named varieties. SEEDS AND SEEDPODS ARE POISONOUS!
Annual, 6-8' tall.


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

Redding, California
Peyton, Colorado
Meriden, Connecticut
Cape Canaveral, Florida
New Port Richey, Florida
Alden, Kansas
Barbourville, Kentucky
Southold, New York
Waverly, New York
Hulbert, Oklahoma
West Newton, Pennsylvania
Sherman, Texas

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