Dioon Species, Cycad, Giant Dioon, Gum Palm

Dioonspinulosum

Genus
Dioon (dy-OH-awn)
Species
spinulosum (spin-yoo-LOH-sum)
Synonym
Sun Exposure
Sun to Partial Shade
Foliage
Grown for foliage
Evergreen
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)
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
Other Details
Category
Cycads
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Bloom Characteristics
Bloom Size
Other details
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
Propagation Methods
From seed; germinate in a damp paper towel
From seed; germinate in vitro in gelatin, agar or other medium
Seed Collecting
Regional

This plant is said to grow outdoors in the following regions:

Berkeley, California

Brentwood, 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

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Gardener's Notes:

6
positives
2
neutrals
0
negative
Sort By:
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S
Jacksonville, FL (Zone 9a) | September 2014 | positive

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 prote...Read More

J
| November 2012 | neutral

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 ...Read More

D
Sumter, SC | February 2011 | positive

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 blac...Read More

B
Hayward, CA | August 2007 | positive

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 fro...Read More

J
J
Central, LA (Zone 8b) | September 2006 | positive

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. Every...Read More

E
E
Windermere, FL | June 2004 | neutral

Great tree, but a painfully slow germinator. I started 5 (3 survived) in early February (south florida, things start to warm up that tim...Read More

H
H
| January 2004 | positive

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

P
Acton, CA (Zone 8b) | September 2003 | positive

This is one of the more commonly grown cycads in cultivation, though still relatively rare in the average garden. It is one of the large...Read More

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