Quick answer: 13 native California plants have a recorded bloom range that includes October.
13 species
- Apache plume Fallugia paradoxa · 6 states
- Black-eyed Susan Rudbeckia hirta · 42 states
- California bay laurel Umbellularia californica · 3 states
- California buckwheat Eriogonum fasciculatum · 2 states
- Cardinal flower Lobelia cardinalis · 37 states
- Coast redwood Sequoia sempervirens · 1 states
- Desert globemallow Sphaeralcea ambigua · 2 states
- Desert marigold Baileya multiradiata · 4 states
- Desert willow Chilopsis linearis · 4 states
- Jojoba Simmondsia chinensis · 2 states
- Scarlet gilia Ipomopsis aggregata · 9 states
- Shrubby cinquefoil Dasiphora fruticosa ssp. floribunda · 15 states
- Wyoming Indian paintbrush Castilleja linariifolia · 4 states