Photo by Melody

PlantFiles: Cycad, Giant Dioon, Gum Palm
Dioon spinulosum

Family: Zamiaceae
Genus: Dioon (dy-OH-awn) (Info)
Species: spinulosum (spin-yoo-LOH-sum) (Info)

2 members have or want this plant for trade.


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)

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)

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:
Sun to Partial Shade

Seed is poisonous if ingested
All parts of plant are poisonous if ingested
Plant has spines or sharp edges; use extreme caution when handling

Bloom Color:

Bloom Time:
Unknown - Tell us

Grown for foliage

Other details:
Average Water Needs; Water regularly; do not overwater
This plant may be considered a protected species; check before digging or gathering seeds

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; germinate in a damp paper towel
From seed; germinate in vitro in gelatin, agar or other medium

Seed Collecting:
Unknown - Tell us

Click thumbnail
to view:

By palmbob
Thumbnail #1 of Dioon spinulosum by palmbob

By palmbob
Thumbnail #2 of Dioon spinulosum by palmbob

By palmbob
Thumbnail #3 of Dioon spinulosum by palmbob

By palmbob
Thumbnail #4 of Dioon spinulosum by palmbob

By palmbob
Thumbnail #5 of Dioon spinulosum by palmbob

By palmbob
Thumbnail #6 of Dioon spinulosum by palmbob

By palmbob
Thumbnail #7 of Dioon spinulosum by palmbob

There are a total of 36 photos.
Click here to view them all!


6 positives
2 neutrals
No negatives

Gardeners' Notes:

Positive southeastgarden On Sep 7, 2014, southeastgarden from Jacksonville, FL (Zone 9a) wrote:

I have grown this plant outdoors for more than a decade in zone 9a under the canopy of a live oak but without any additional winter protection. It does not show cold damage until winter temperatures dip into the low 20's F. It has been defoliated a few times by lows around 18 degrees but always produces a new crown in spring. It grows very slowly here but looks great most of the time.

Neutral JohnPirate On Nov 5, 2012, JohnPirate from Auckland
New Zealand wrote:

I bought a bulb 150mm in diameter 2 1/2 years ago and have ot in a pot and feed and water it regularly. There is NO growth, but the bulb looks healthy....perhaps it is thinking what to do.....!

Positive donnacreation On Feb 14, 2011, donnacreation from Sumter, SC (Zone 8a) wrote:

This cycad can be grown in zone 8a with winter protection. I pack pinestraw all around and on top of the plant, and then cover with black plastic, secured by stones.

Positive BayAreaTropics On Aug 11, 2007, BayAreaTropics from Hayward, CA wrote:

One of the most reliable cycads for the bay area.It can be counted on to flush every year-sometimes twice,although the early flush is from last years growth ,but still... Looks best with some shade from hottest summer sun. Upper 20's have not affected mine.Fertilize in summer. Beautiful slow growing container plant. Very rare to spot one here outside of botanical gardens. That's a shame because they look and do great.

Positive jeri11 On Sep 11, 2006, jeri11 from Central, LA (Zone 8b) wrote:

I live in zone 8b and have had this palm for 9 years. It dies back to the ground every year thus I have never had over two years. Everyone thinks it's a sago. But I love it anyway.

Neutral epic1 On Jun 18, 2004, epic1 from Windermere, FL wrote:

Great tree, but a painfully slow germinator. I started 5 (3 survived) in early February (south florida, things start to warm up that time of year). It is now mid june, and all are still developing a crown, with no sign of splitting to allow a leaf. In contrast, I started a c. revoluta in March, and it now bears a single leaf, measuring 6in long by 3in wide. Maybe by next feb I can expect a few leaves.

Positive hactx On Jan 3, 2004, hactx wrote:

I have two young cycad plants out of a total of 5. They are about 5 months old add about a foot tall.

Positive palmbob On Sep 25, 2003, palmbob from Acton, CA (Zone 8b) wrote:

This is one of the more commonly grown cycads in cultivation, though still relatively rare in the average garden. It is one of the largest cycads, too, getting up to 20'+ in the tropics (Mexico). It has wide, tapering, pointed leaflets which are very smooth and sea-green. It is one of the more frost tender cycads with frosts down to about 28F damaging the foliage. However, the plant will easily survive those temps, and new leaves will come out in the spring.


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

Berkeley, California
Encinitas, California
Hayward, California
Huntington Beach, California
La Mesa, California
Reseda, California
San Anselmo, California
Santa Barbara, California
Thousand Oaks, California
Yorba Linda, California
Boca Raton, Florida
Brandon, Florida
Fort Myers, Florida
Jacksonville, Florida
Port Charlotte, Florida
Venice, Florida
Windermere, Florida
Brunswick, Georgia
Greenwell Springs, Louisiana
Beaufort, South Carolina (2 reports)
Bluffton, South Carolina
Hilton Head Island, South Carolina
Sumter, South Carolina

We recommend Firefox
Overwhelmed? There's a lot to see here. Try starting at our homepage.

[ Home | About | Advertise | Media Kit | Mission | Featured Companies | Submit an Article | Terms of Use | Tour | Rules | Privacy Policy | Contact Us ]

Back to the top

Copyright © 2000-2015 Dave's Garden, an Internet Brands company. All Rights Reserved.

Hope for America