Katie Ruellia
Ruellia simplex Katie
A fragrant purple-flowering groundcover that attracts bees and pollinators throughout the warm season.
A root-hardy perennial in USDA zones 8-11 that dies back in the low 20s°F and returns each spring, thriving in low-desert heat and tolerating both drought and occasional wet soil.
AMWUA Notes
A well-behaved dwarf ruellia; unlike its tall relative it sets little viable seed, so it will not colonize the garden.
Care Guide
Water every 7-10 days in summer for steady bloom; this compact dwarf ruellia tolerates a range of moisture and even brief flooding but keeps flowering best with regular water.
Shear off spent blooms and tidy the clump through the season, then cut back to a few inches in late winter to remove frost damage; unlike the tall species it is a sterile, non-seeding dwarf.
Feed lightly in spring; it blooms freely without heavy fertilizing.
Largely pest-free; avoid confusing it with the invasive tall Mexican petunia, which seeds aggressively.
Purple funnel flowers appear spring through fall; foliage freezes back in the low 20s°F and resprouts reliably from the crown in spring.
Soil, Feeding & Propagation
Adaptable to most soils including clay and periodically wet ground; tolerates poor drainage and brief flooding better than most groundcovers.
Needs moderate soil.
Low feeder.
Division of clumps or softwood cuttings; the dwarf Katie is sterile and sets little viable seed.
1.5-2 ft on center for a low mounding mass
Well-behaved clumping roots; unlike the invasive tall Mexican petunia it does not colonize by seed.
Placement Tips
- •Space 18-24 in apart for a low mounding mass in pollinator and color beds.
- •A tidy, non-seeding front-of-border edge that stays compact around walks and patios.
- •Tolerates poorly drained and periodically wet spots better than most groundcovers.
- •Plant in full sun to light shade; bloom is heaviest in full sun.
Features
Best Uses
Ecological Value
Attracts
Wildlife Value
Companion Plants
Quick Stats
Design Styles
Include in Your Project
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Use this care guide to maintain your Katie Ruellia. Questions about your landscape? Reach out anytime.
Data from 2024 AMWUA “Landscape Plants for the Arizona Desert” guide.