Scientific: Leucophyllum zygophyllum
Common: blue ranger
Family: Scrophulariaceae
Origin: Chihuahuan Desert

Pronounciation: Lou-co-FIL-lum zi-go-FIL-lum

Hardiness zones:
Sunset 7-24
USDA 8 - 11

Landscape Use: Accent, informal hedge, filler shrub for xeric landscape design styles.

Form & Character: Evergreen shrub to sometimes nearly deciduous in winter, rounded to irregular, dry looking.

Growth Habit: This is a somewhat smallish and dense Leucophyllum that might only grow to 4 to 6 feet tall with equal spread.

Foliage/Texture: Mostly alternate, densely tomentose including young stems, whitish silver, rounded and slightly cupped leaves leaves; medium fine texture.

Flowers & Fruits: Single, axillary indigo blue flowers, fruit inconspicuous.

Seasonal Color: Showy bloomer especially during the fall, with dark blue flowers caste against a whitish gray leaf backdrop.

Temperature: Hardy to 10oF

Light: Full sun

Soil: Tolerant

Watering: Blue ranger should not be irrigated during the winter months (except during times of extreme drought such as the great Phoenix winter drought of 2005-06). Otherwise, irrigate blue ranger regularly but infrequently during summer.

Pruning: Blue ranger requires little pruning if planted in the right location. Head back lightly in late February, and please, do not shear!

Propagation: Vegetative softwood cutting

Disease and pests: In the Phoenix area, Texas root rot is possible in heavy soils of former agricultural use, particularly those that grew cotton in earlier decades.

Additional comments: L. zygophyllum var. cimarron (from Mountain States Wholesale Nursery) is relatively small shrub and is a great varietal selection for Phoenix landscape borders. It is also a nice substitute for L. candidum var. thunder cloud in Phoenix clay soils because it is slightly less prone to root rot in lesser drained soils.