Family: Onagraceae

Origin, Description & Uses
Oenothera lindheimeri (gaura), also known as Lindheimer’s beeblossom, is native to the southern United States, particularly Texas and Louisiana. This graceful, herbaceous perennial is prized for its airy sprays of delicate, butterfly-like flowers that range from white to soft pink and bloom over a long season. Its slender stems and light, open form make it a popular choice for ornamental gardens, borders, and naturalistic landscapes. Gaura is drought-tolerant once established and attracts pollinators such as bees and butterflies, adding both ecological and aesthetic value to gardens.

Risks & Threats
Although considered low risk in Hawaiʻi, Oenothera lindheimeri has shown invasive tendencies in some regions outside its native range, where it can spread readily under favorable conditions. It produces abundant seeds and can naturalize in disturbed areas. In Hawaiʻi, it has not demonstrated significant invasive behavior, but caution is still advised when planting. Gardeners should monitor for unwanted spread and avoid planting near sensitive natural areas. Choosing responsible planting practices can help ensure this species remains a safe and attractive addition to the landscape.

High Risk Traits:

• Declared weed: Noxious in NSW, Australia; environmental weed elsewhere in Australia.
  
• Invasive: Invasive in California, eastern US, and South Africa.
  
• Congeneric weeds: Other species are invasive.
  
• Fire hazard: Forms dense thickets in dry climates.
  
• Deer-resistant: Unpalatable to grazing animals.
  
• Spreads vegetatively: Reproduces via rhizomes.
  
• Resprouts: Tolerates cutting and freezing.
  
• Climate versatility: USDA Zones 5–10.
  
• Soil versatility: Tolerates sand, clay, and alkaline soils.
  
• Self-sows: Produces viable seed.
  
• Flowers first year: Short generation time.

Low Risk Traits:

• Not agricultural: No significant agricultural weed status.
  
• No spines or thorns.
  
• Non-toxic: Safe for animals, humans, and allergy sufferers.
  
• Not shade-tolerant.
  
• Self-incompatible: Requires cross-pollination.
  
• Poor dispersal: Large seeds in woody capsules; no wind, water, or animal dispersal.