For now, most of this compilation is from the Bay Area. We hope to soon include talks and seminars from other parts of California.
Common Ground garden supply in Palo Alto offers classes and talks in many areas of landscaping, garden cultivation, plant choice, and irrigation. Elizabeth Gamble Gardens in Palo Alto offers classes and talks on many topics.
North Bay and San Francisco (Yerba Buena) California Native plant chapter has an events listing, and many other local resources.
Marin Chapter California Native Plant Society has links to North Bay talks. Master Gardener of Santa Clara county has talks and courses they offer.
The Western Horticultural Society has a speaker program worth checking out.
The Elizabeth Gamble Gardens website has an excellent list of courses offered both by local colleges, and by organizations like Common Ground for people in the Bay Area.
Foothill Junior College has an AA degree in Horticulture.
The California Invasive Plant Council offers Wildland Weed Field Courses.