Alphabetical Plant Listing

Dioon spinulosum (Giant Dioon)

Gum Palm, Giant Dioon, Mexican Dioon


One of the tallest cycads in the world, Dioon spinulosum (Giant Dioon) is an elegant, palm-like, evergreen cycad with an open rosette of perfectly arranged, blue-green, pinnate fronds, up to 6 ft. long (180 cm). They radiate out from the trunk and arch with grace. Borne atop a short stocky trunk, up to 16 in. wide (40 cm), the leaves are divided into up to 120-240 narrow leaflets, armed with small teeth along their edges. This plant is dioecious, presenting separate male and female plants. Distinctive cones appear on male and female plants. The female seed cones are very large, up to 30 in. long (75 cm), weighing about 30 pounds (15 kg). Resembling pineapples, the seed cones are very decorative and can contain up to 300 or more seeds. When mature, the cones will burst open, scattering their seeds. Frost, heat, sun and drought tolerant, Dioon spinulosum is also one of the most cold hardy cycads. It can survive temperatures down to 28ºF (-2ºC). Long lived (several hundred years), Giant Dioon is one of the oldest plants still living on the planet since it flourished over 170 million years ago. Slow to moderately fast growing, it is easy to grow and is an excellent choice for low-maintenance gardens where its lush foliage adds a tropical touch. Spectacular as a specimen and striking in groupings.

  • Grows up to 4-12 ft. tall and wide (120-360 cm).
  • Easily grown in moist, gritty, well-drained soils in full sun to part shade. Best in partial shade, especially in hotter climates. Drought tolerant once established.
  • No serious disease or pest issues.
  • Propagate by seeds or by division and replanting of the offsets formed at the base of the oldest plant.
  • Native to Mexico.

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Requirements

Hardiness 9 – 11
Plant Type Palms - Cycads
Plant Family Palms - Cycads
Exposure Full Sun, Partial Sun
Season of Interest Spring (Early,Mid,Late)
Summer (Early,Mid,Late)
Fall
Winter
Height 4' – 12' (120cm – 3.6m)
Spread 4' – 12' (120cm – 3.6m)
Water Needs Average
Maintenance Low
Soil Type Chalk, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Showy, Evergreen, Fruit & Berries
Tolerance Drought
Garden Uses Beds and Borders
Garden Styles Mediterranean Garden

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While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 9 – 11
Plant Type Palms - Cycads
Plant Family Palms - Cycads
Exposure Full Sun, Partial Sun
Season of Interest Spring (Early,Mid,Late)
Summer (Early,Mid,Late)
Fall
Winter
Height 4' – 12' (120cm – 3.6m)
Spread 4' – 12' (120cm – 3.6m)
Water Needs Average
Maintenance Low
Soil Type Chalk, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Showy, Evergreen, Fruit & Berries
Tolerance Drought
Garden Uses Beds and Borders
Garden Styles Mediterranean Garden

Great Plant Combination Ideas with Palms - Cycads

Guides with Palms - Cycads

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