CAUTION: Post Storm Damage to Coastal Trail
The Presidio Coastal Trail segment just north of the Pacific Overlook and adjacent to Lincoln Blvd remains CLOSED indefinitely. We have posted signage to alert bicyclists and hikers and with information for safe trail alternatives. More »
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 was the only Army airfield in the western United States continuously active from 1919 to 1936.