Dioon spinulosum
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Dioon spinulosum

Giant dioon · Gum palm

Tier 2 Difficulty: easy Water: low Light: partial_sun
Temperature
20–37 °C
Soil pH
6–8
Hardiness
Zone 9–11
Click count
27
Observations
123

Description

Source: leafsnap

Dioon spinulosum, giant dioon, or gum palm, is a cycad endemic to limestone cliffs and rocky hillsides in the tropical rainforests of Veracruz and Oaxaca, Mexico. It is one of the tallest cycads in the world, growing to 12m in height. The tree is found at low elevations to 300 m above sea level.Dioon spinulosum prefers well-drained soil with regular water. It will grow in soils containing few nutrients, in soils rich in limestone, and on slopes. It is hardy to USDA Zones 9B – 11. Dioon spinulosum has pinnate leaves that grow to about 5–7 ft (1.5-2.1 m) in length and radiate out from the trunk. The 120-240 leaflets on each leaf are small and flat, have small thorns and taper to a sharp point.

Care Guide

💧 Water

The gum palm thrives in arid conditions and is highly drought-tolerant, requiring water only once every one to two weeks. Although it is typically grown outdoors, it prefers well-drained soil, which emphasizes its suitability for environments with low water availability.

☀️ Light Partial sun

Gum palm occurs naturally in habitats like forest understories or rocky areas, where it grows under natural shade. It prefers partial sun but can tolerate full sun or full shade, showing its adaptable and hardy nature.

Ideal: Partial sun
🌡️ Temperature 20–37.8°C

Gum palm comes from tropical areas, where the climate is generally warm and humid. As a result, it is well suited to high temperatures and moisture. It does not tolerate abrupt temperature changes and prefers a steady temperature environment, so it's important to prevent temperature fluctuations indoors. It typically cannot withstand cold and needs warmer conditions to grow. If the surrounding temperature falls too low, the plant may stop growing or even die.

Ideal temperature: 20–37.8°C
💨 Humidity
Humidity:
🪴 Soil 6-8
Soil pH: 6-8
🌱 Fertilizer

The gum palm has distinct nutrient needs and does not require heavy fertilization. Fertilizing in spring is best for encouraging optimal growth. Supplying nutrients enhances its health, increases its resistance to pests and diseases, and helps sustain its long lifespan.

🪴 Pot & Repot Every 2 years
Suggested frequency: Every 2 years
✂️ Pruning

The gum palm benefits from pruning dead fronds in early spring. Be careful not to over-prune, as it can stress the plant. This practice improves air circulation, reduces pests, and maintains the palm's aesthetic appeal. Use clean tools to make precise cuts and reduce the risk of disease, following seasonal guidelines to promote optimal growth.

🌿 Propagating
🐛 Diseases & pets
☠️ Toxicity

Characteristics

Plant Type
Palm
Life Cycle
Perennial
Genus
Dioon
Family
Zamiaceae
Hardiness Zone
9-11
Mature Height
4.88 m to 10.06 m
Mature Spread
3.05 m to 4.88 m
Leaf Color
Dark Green
Leaf Type
Evergreen
Bloom Time
Late spring, Early summer
Planting Time
Spring, Summer, Autumn
Harvest Time
Late summer, Early fall, Mid fall
Native Area
Mexico

Tags (6)

Common Names (2)

en Giant dioon
en Gum palm