Dioon edule ‘Queretaro Blue’
 
Common Names Chestnut Dioon, Queretaro Blue Dioon
 
Zones 8B–11
 
Dioon edule ‘Queretaro Blue’ is a regional form of Dioon edule native to the highlands of Querétaro, Mexico. This variety is prized for its compact stature and striking blue-toned foliage, especially when grown in full sun. Adapted to rocky, exposed slopes and seasonal drought, it offers exceptional cold tolerance and architectural symmetry—making it ideal for xeric landscapes and frost-prone gardens.
 
Key Features
Growth Habit: Upright, symmetrical; slow-growing
Height: Typically 3–6 ft; trunk may reach 18–24 inches over decades
Trunk: Cylindrical, rough; retains persistent leaf bases
Leaves: Pinnate; 3–4 ft long; leaflets narrow, spine-tipped, arranged in a shallow V; juvenile foliage often silvery-blue in full sun
Petiole: Short; spiny near base
Inflorescence: Dioecious; male cones cylindrical and tan; female cones woolly and compact
Fruit: Seeds large, tan to brown; toxic if ingested
Ecology: Native to dry oak woodlands and thorn forests at elevation; drought and frost adapted
 
Growing Conditions
Light: Full sun to partial shade; brighter exposure enhances blue tones
Watering: Moderate; allow soil to dry between waterings
Soil: Sharp-draining mix; tolerates mildly acidic to alkaline pH
Temperature: 45–95°F (7–35°C); tolerates brief dips into the teens°F
Humidity: Moderate; adaptable to dry air
Propagation: By seed or basal offsets (“pups”)
Tolerance: Drought, frost, and rocky soils; avoid waterlogging
 
Landscape Use Ideal for xeriscapes, porch containers, and frost-prone gardens. Pairs well with Agave parryi, Nolina texana, and Quercus polymorpha for a rugged, highland palette.