Wow, thank you all so much! There are so many threads here I wasn't sure if anyone would notice. This is my first time posting on permies.com (though not my first time getting helpful information from the forums) so many thanks for the warm welcome.
A couple notes about the yard:
I'm a renter in one of those situations where the landlord does the bare legal minimum and doesn't care what you do as long as you pay rent and don't burn the place down. This has pros and cons--the biggest Pro is that I have a free hand with the yard. I can do whatever I want. And for the record I despise lawns. Absolutely have no use for them whatsoever.
The Con is that the landlord hasn't had anyone come out to do anything with the yard for who know how long, so the neighbor has been dealing with a completely untended patch populated by some shady renters who occcasionally emerge for a smoke. So she took matters into her own hands. I don't blame her too much, just for being ignorant. I only moved in in July, this is what I walked into.
It's a small yard in a small city in CA, about halfway between sacramento and redding. Lots of sun, strips and corners of shade, a couple of landscapy shrubs, a bamboo fence on one side, wooden stockade style on the other. Arid and unreasonably hot in summer, rainy and chilly in "winter," not much of a transitory season. Lots of nuts right now. Chris Kott, thanks for the advice and condolences.