Acacia Removal

Reducing wildfire risk and protecting rare plant habitat in Old St. Hilary's Preserve.


Acacia removal continued in 2020 with the assistance of the Tam Fire Crew and Parks resource staff. No burn piles have been needed for follow-up removal efforts. Debris was chipped on site.

Removing seedlings which sprout from bean-like acacia seed pods is critical to the long-term success of the acacia removal in Old St. Hilary’s. Manual methods have included

  • “flaming”,  using the flame of propane torches to hover over seedlings to steam or singe small seedlings
  • uprooting using a hula-hoe
  • hand pulling

Some areas have been selected for active planting after acacia removal, while others will continue to recover naturally. In the winter of 2019–20, volunteers planted native plants grown from seeds collected at the preserve, and then grown at the native plant nursery, to speed recovery of grasslands in the lower footprint of the 2018–19 acacia removal.

UPDATED: JUNE 24, 2019

In 2019, Marin County Parks and Marin County Fire began collaborating on the long-term initiative to reduce fire risk in Old St. Hilary's, and establish defensible space near a residential area in Tiburon. A large stand of invasive acacia was removed. In June 2019, Marin County Fire crews completed a pile burn of the acacia debris, after allowing for optimal drying and curing.