Family: Malvaceae

Origin, Description & Uses:
Malva subovata subsp. subovata, commonly known as tree mallow, is native to the western and central Mediterranean region. It is a fast-growing, woody shrub that can reach several feet in height, with soft, gray-green, rounded leaves and attractive pale pink to lavender flowers that resemble small hibiscus blooms. Tree mallow is often used as an ornamental plant in dry, coastal, or Mediterranean-style gardens due to its tolerance of wind, salt spray, and drought. It is valued for adding soft texture and long-lasting color to landscapes, and it can also be used as a hedge or informal screen in suitable climates.

Risks & Threats:
Tree mallow is considered low risk for Hawaiʻi. While it is well adapted to dry conditions and can grow vigorously, there is little evidence that it spreads aggressively or becomes invasive in the islands. It does not appear to significantly outcompete native vegetation or disrupt natural ecosystems. As with many non-native plants, responsible gardening practices—such as proper placement and monitoring for unwanted spread—are recommended. Overall, Malva subovata subsp. subovata is regarded as a safe choice for landscaping when managed appropriately.

High Risk Traits:

• Repeated introductions outside native range (popular ornamental in Arizona and California)
  
• Reproduces by viable seed
  
• Fast growth rate; reaches maturity in 1–2 years
  
• Tolerates pruning and benefits from mutilation
  
• Propagules dispersed intentionally by people
  
• Possibly naturalized in England

Low Risk Traits:

• No evidence of naturalization in tropical/subtropical regions
  
• Not a weed (garden, agricultural, or environmental)
  
• No spines, thorns, or burrs
  
• Not toxic to animals or humans
  
• Not shade tolerant
  
• Narrow soil pH requirement (mildly alkaline)
  
• Self-incompatible (requires cross-pollination)
  
• Propagules not adapted for wind, water, bird, or animal dispersal