View photos of the edible plant, Washingtonia filifera (California fan palm), profiled in Wild Edible Plants of California: Vol 1.

A passage from Wild Edible Plants of California (Vol 1):

A healthy Fan palm can produce large fruit clusters, some weighing up to 20lbs. each. Clusters on small to medium tall trees can be knocked to the ground with a long pole or pool skimmer. But more often than not the tree will need to be scaled. Or, simply wait for what the weather knocks to the ground.