In addition, Garry oak, typical of California, can be found as far north as Vancouver Island.

A tiny population of Garry oak occurs at the eastern end - the northernmost natural occurrence of this species along the coast.

Flora on the reserve include great and common camas and stands of wind-adapted Garry oaks that cover the island.

It is most abundant in dry, open woodlands of Ponderosa pine, Garry oak, and madrone.

Some Garry oak is present at the forest edge.

Large deciduous trees are black cottonwood, bigleaf maple, red alder, and Garry oak.

Trees unique to this area include the Arbutus, Garry oak, and manzanita.

The disturbance that allowed Garry oak to persist in an area that would otherwise succeed to coniferous forest was primarily fire.

Mature Garry oaks are fire resistant, and so would not be severely harmed by grass fires of low intensity.

In Oregon and Washington, it may also be associated with the Garry oak (Quercus garryana).