Photo by Melody

PlantFiles: Cycad, Giant Dioon, Gum Palm
Dioon spinulosum

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

2 members have or want this plant for trade.

Category:
Cycads

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)

Spacing:
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:
Sun to Partial Shade

Danger:
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:
Inconspicuous/none

Bloom Time:
Unknown - Tell us

Foliage:
Grown for foliage
Evergreen
Leathery-Textured

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

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There are a total of 36 photos.
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Profile:

5 positives
2 neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
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.

Regional...

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

Berkeley, California
Encinitas, California
Hayward, California
Huntington Beach, California
La Mesa, California
Mission Canyon, California
Reseda, California
San Anselmo, California
Thousand Oaks, California
Yorba Linda, California
Boca Del Mar, Florida
Brandon, Florida
Fort Myers, Florida
Lake Butter, Florida
Port Charlotte, Florida
South Venice, Florida
Brunswick, Georgia
Greenwell Springs, Louisiana
Beaufort, South Carolina
Bluffton, South Carolina
East Sumter, South Carolina
Hilton Head Island, South Carolina
Parris Island, South Carolina



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