I have corn husk, banana peels, egg shells, stripped card board, old spinach, old celery, old carrots, onion peels all collected. And after this week, a watermelon rine will be available.
Love OGK always got some growing or glowing...I'm really liking the DTE products with my kush .....I'm usually not an organic grower I have always used at least a few non org nutes ....but this year I set a few aside to do organic and I'm using the DTE line it's great so far ....good luck with your grow just wanted to give my two cents cause I love me some real OGK ....
Comfrey is the shit btw. I highly recommend it for mulching and FPE, my wife makes me share it with the chickens. That's alright, last year I bought a 1 gallon comfrey plant for $5 and made 15 root cuttings. My dozen plants should divide into at least 40 this year. Best $5 I've ever spent for my garden.
California has really strict rules I dont think I would worry too much about it If it's all you can get. Sometimes it's because they contain molybdenum which is essential to plant health and is natural occurring in soil. Don't quote me on any of this all off the top of my head...