 
				
				
					Dioon spinulosum
Giant Dioon
| Family | 
| Zamiaceae | 
| Genus | 
| Dioon | 
| Species | 
| spinulosum | 
| Category | 
| Tropicals, Woody | 
| Type | 
| Shrub (evergreen) | 
| USDA Hardiness Zone | 
| 9b - 11 | 
| Canadian Hardiness Zone | 
| 9a and greater | 
| RHS Hardiness Zone | 
| H1c - H3 | 
| Temperature (°C) | 
| -5 to 10 | 
| Temperature (°F) | 
| 23 to 50 | 
| Height | 
| 5 to 15 m | 
| Spread | 
| 1.5 to 2 m | 











 
	| General Description | 
| This cycad is one of the tallest species in its genus. A single trunk supports large, green, leaves that radiate from the centre. | 
| Landscape | 
| Rock garden, city landscaping, and as a single specimen. | 
| Cultivation | 
| Grow in moist, gritty, well-drained soil in partial shade. | 
| Shape | 
| Upright to rounded. | 
| Growth | 
| Fast | 
| Pests | 
| No notable pests or diseases. | 
| Habitat | 
| Limestone cliffs, rocky hillsides, and tropical rainforests. | 
| Leaf Description | 
| Green, pinnate leaves measuring 1.5 to 2 m radiate from the top of the stem. | 
| Notable Specimens | 
| Chelsea Physic Garden, London, United Kingdom. | 
| Propagation | 
| Propagate by seed or division. |