Top Left: Fennel, NPS photo
Top Right: Olive Tree, NPS photo
Bottom: Harding Grass, NPS photo

Invasive plant species display particular characteristics like fast growth, high seed production, and rapid maturation that, when combined with a lack of the natural competitors and diseases that help control them in their native environment, allow them to rapidly grow and spread. Over 250 invasive plant species are found in Coastal Southern California national parks. These species threaten our parks, which act as natural refuges in the largely developed Southern California area, by permeating the landscape, altering ecosystem processes, displacing and deteriorating habitat for many native plants and animals.