This is my first year with a permie garden. While it is small, I still want to use cover crops this winter. I was thinking a mix of daikon and fava beans, planted around September. I would use winter wheat (an accident from last year's sheet mulching - live seeds in the straw) but here we are basically in june and the plants are still going strong.
" With all the changes, nothing changes, no matter what you're told."
Almost anything will survive a mild winter in your climate assuming a good microclimate for the garden beds.
What does the soil need? Pick something to feed the soil that you can eat, too, if it doesn't die. Your choices are good, you could add several other types of beans, buckwheat, or winter greens like kale that you can eat most of the winter.
"You must be the change you want to see in the world." "First they ignore you, then they laugh at you, then they fight you, then you win." --Mahatma Gandhi
"Preach the Gospel always, and if necessary, use words." --Francis of Assisi.
"Family farms work when the whole family works the farm." -- Adam Klaus
Companion Planting Guide by World Permaculture Association