the easiest plants ive EVER grown is Sage and Goji berries. They stay sooooo long to.
the sage lasted for id say 3 years with NO death. no watering, litterally NOTHING. it just survived forever with no effort and still tasted and smelt amazing! (Yes, went threw winter to!) soso recommend sage.
we watered it for like the first year and just stopped and it still survived. Of course it rained, but my point is is we didnt go out there with a watering can and water it, it just survived itself.
gohji berries my chickens love love love. i often dry them or swallow them whole, because biting into them raw is quite bitter. they hang and grow upsidedown so wild birds often wont grab them and rabbits cant reach them! Perfect plant