Not sure what you mean by "significant" but we grow plenty of our own over here in the S.E.
I thought CA agriculture had already been severely impacted by lack of water, no?
The bad news is that no matter where one's food comes from a reduction in the supply from CA will likely mean prices rise for everyone.
Fern
California, where cool coastal fog is perfect for growing standard broccoli, currently produces more than 90 percent of the broccoli grown in the United States.
California produces a sizable majority of many American fruits, vegetables, and nuts: 99 percent of artichokes, 99 percent of walnuts, 97 percent of kiwis, 97 percent of plums, 95 percent of celery, 95 percent of garlic, 89 percent of cauliflower, 71 percent of spinach, and 69 percent of carrots (and the
list goes on and on). Some of this is due to climate and soil. No other state, or even a combination of states, can match Californias output per acre. Lemon
yields in California, for example, are more than 50 percent higher
than in Arizona. California spinach yield per acre is
60 percent higher than the national average. Without California, supply of all these products in the United States and abroad would dip, and in the first few years, a few might be nearly impossible to find. Orchard-based products in particular, such as nuts and some fruits, would take many years to spring back.
We grow a lot.