ladder fuel
Ladder fuel is any vegetation that forms a continuous vertical connection between ground-level fuels and the forest canopy, allowing fire to climb from the forest floor into the crown. The term is used by the USDA Forest Service and CAL FIRE to describe one of the primary structural conditions that converts a ground fire into a crown fire.
In the Santa Cruz Mountains, ivy is among the most significant ladder fuels present in residential and wildland-urban interface zones. A climbing cord of aerial ivy — evergreen, dense, and running continuously from the forest floor to the canopy — fits the structural definition precisely. During the CZU Fire, ivy burned as both ground fuel and ladder fuel, with aerial cords carrying fire upward into tree crowns throughout the San Lorenzo Valley.
Removing ivy from trees eliminates this vertical fuel connection. It is one of the few habitat restoration actions that simultaneously benefits the food web, the watershed, and fire preparedness.
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