04/24/2025
In Florida, 16 exotic grasses are considered invasive.
The Florida Exotic Plant Pest Council (FLEPCC) lists these 16 as being invasive. These grasses, often of African origin, were initially introduced as forages but have since become problematic due to their rapid spread and adaptability.
Two photos on the left: Imperata cylindrica, also known as cogongrass, is an invasive perennial grass native to Asia and East Africa. It can grow up to 6 ft tall and forms dense, circular infestations that exclude other vegetation. Origins and introduction: Cogongrass is native to Southeast Asia, China, Japan, Korea, and India. It was accidentally introduced to the southeastern United States in packing materials in the early 1900s. It was also intentionally introduced to stabilize soils.
Two photos on the right: Yes, elephant grass, also known as Napier grass, is considered an invasive species in many regions. It's a rapidly growing, aggressive grass that can outcompete native plants and disrupt ecosystems.
Here's why it's considered invasive:
Rapid growth and spread:
Elephant grass spreads quickly via seeds and underground rhizomes, forming dense stands that can dominate areas.
Outcompeting native plants:
Its aggressive growth can outshade and displace native vegetation, altering plant communities and potentially impacting biodiversity.
Ecological impacts:
It can alter fire regimes, block water flow, and impact flood control systems, according to Florida Exotic Pest Plant Council.
Hybridization:
It can hybridize with native grasses, potentially creating new invasive types.
Agricultural impacts:
It can be a nuisance in agricultural settings and disrupt sugar cane plantations, according to UF/IFAS Plant Directory.
Where it's invasive:
Elephant grass is considered invasive in warm, frost-free regions of Asia, Europe, North and South America, and Oceania, according to the Missouri Botanical Garden. It is particularly problematic in areas with tropical or subtropical climates and where it can reproduce sexually, such as in warm winter regions.