• East view from Crissy Field overlook with old Coast Guard station on left and city on right

    Presidio of San Francisco

    California

Non-native Flowers

Before the Europeans arrived, wildflowers in the Presidio had grown here for tens of thousands of years.

By introducing non-native flowers and other plant species, settlers drastically altered the landscape.

While some of these new flowers ... or "outsiders" ... don't seem to threaten our native species or ecosystems, many are invasive.

Invasive means "outsiders" can spread quickly to disrupt or push-out native plant species. There are a lot of reasons: "Outsiders" aren't bothered by local diseases or local animals don't like eating the new flowers or the "outsiders" produce a lot of seeds or they have accelerated reproductive cycles.

To bring balance back into our environment, these "outsiders" have to be removed ... by hand. It's incredibly hard work and takes literally years to change the land back to its original state.

Did You Know?

Crissy Field around 1940

During 1941 and 1942, Japanese-American language specialists were trained at the Military Intelligence Service Language School at Crissy Field.