Scientific: Glandularia rigida (formerly Verbena rigida)
Common: sandpaper verbena
Family: Verbenaceae
Origin: South Brazil and Argentina, and has naturalized in the southeast United States.

Pronounciation: Glan-du-LAR-ee-a RI-gi-da

Hardiness zones
Sunset
All, perennial in warmer climates
USDA All, perennial in warmer climates

Landscape Use: Accent and/or border plant for xeric landscape areas, ground cover for smaller landscape spaces, rock gardens.

Form & Character: Herbaceous perennial, very stiff and sparse when young, "rough looking" and unkept in appearance when not flowering.

Growth Habit: Low, prostrate and spreading to 1.5 feet. Slow to establish.

Foliage/Texture: Sessile, scabrous, dull green, irregularly serrate, oblong and clasping, medium to medium-coarse texture

Flowers & Fruits: Clusters of light purple flowers on extended spikes arranged in threes; fruit inconspicuous.

Seasonal Color: Purple or magenta flowers during growing season.

Temperature: Tolerant

Light: Full sun to partial shade.

Soil: Fast draining is best and prefers sandy soils. Sandpaper verbena is quite salt sensitive. In Phoenix, best used in landscaped areas mulched with decomposing granite.

Watering: Infrequent to regular water in Phoenix. Irrigation with drip systems might exacerbate exposure to salt build up in the soil causing plant failure.

Pruning: Head back after flowering

Propagation: Seed

Disease and pests: Root rot if soil is poorly drained

Additional comments: Currently, sandpaper verbena is the least used of all Glandularia taxa in Phoenix landscapes because of it propensity to have marginal leaf necrosis and tatter. Sometimes it is best used as an annual landscape bedding plant. Roots are tuberous. Blooms first year from seed. White-flowering cultivar called 'Alba'. Subject to salt burn on leaf margins in Phoenix.