self-seeding greens

Hi David,
I love self seeding greens, like turnip greens, curly mallow, swiss chard, and sweet cicely. Can you think of others? I would love to cultivate more.
Thanks,
John S
PDX OR

My mustard came back like gangbusters this year, and I'm hoping for many to come. Also lettuce, if you are like me and plant too much and let it go to seed....

Here in Maine I've never had chard go to seed - is it biennial (I know it's related to beets)?

And of course the good "weeds" - lambsquarters being the first that comes to mind, but I've also got a lot of violets growing near the garden.

I grew some giant chard that was biennial. It's a great green, and yielded tons of seeds its second season. Salad rocket is another good self seeder that's loose in my garden. Dandelion and wild lettuce of course. Yellow dock is another one that is ever present around here.
Celery is one plant I have just had go to seed and want to see and taste more of.

At my place:
Arugla (rocket), both annual Eruca saliva which self-seeded in the hoop house, and perennial Diplotaxis tenuifolia which transported to my new property on an empty clay pot.
Cilantro
Lettuces got into everything the year I wanted to see what the flowers looked like. That took about 2 years to grub out (pre-permie tidy gardening)
Chard has come back in the hoop house too. I guess things kind of got out of hand last summer but I have some actual experience on the power of neglect.

My bok choy self seeded , which was a nice surprise

Like most of you I love volunteers or self-seeded plants. I almost always get volunteers from red Hopi amaranth (Amaranthus cruentus), vine spinach or basella (Basella rubra) , quail grass (Celosia argentea), rice beans (vigna umbellata)spider wisp (Cleome gyandra), purslane (Portulaca oleracae), orach (Atriplex hortensis), shiso (Perilla fructans), and hyacinth beans (Lablab purpureus), as well as some of the ones others have mentioned. The edge of the compost piles is always a rich zone for free plants. One of the great things about self-seeders is they select for success in your conditions and they decide when is a good time to sprout, saving you some guesswork.