- HPRWA SCORE 26
- FAMILY Poaceae
- CATEGORY Grasses & Groundcovers
pampas grass (Cortaderia jubata, Cortaderia selloana)
Considered very invasive; C. jubata is on the Hawai`i State Noxious Weed List. The Division of Forestry and Wildlife of the Hawai`i Department of Land and Natural Resources has designated this species as one of Hawai`i's Most Invasive Horticultural Plants.
- Large clumping grass that may reach 6 ft or taller
- Leaves are narrow and have sharp, serrated edges
- Showy white to purple flower plumes (24 - 31 in) tower three times higher than the foliage
- C. jubata plants have both female and male flowers and are able to produce viable seeds without cross-pollination
- C. selloana plants have either male or female flowers and require cross-pollination between male and female plants to produce viable seeds
- C. jubata was controlled on Mau`i, C. selloana is on O`ahu and Big Island; both species are native to South America
- Multiple seeds spread far by the wind
- In native forests they outcompete native plants, create a fire hazard, and may impact watersheds by changing the natural water cycle.
- The invasive nature of C. selloana was not historically recognized in Hawai`i because only female plants had been cultivated by cuttings. Male plants are now present and this species is starting to spread.
- Both are serious pests in California and New Zealand