What do you allow to self seed?

[Gearoid]

Quite a bit, mainly bronze fennel (love this plant so much), verbena bonariensis, cerinthe, calendula, californian poppies, foxglove and nigella.

[sparrow100]

Not that much, because my beds get a thorough digging over and I don't have many with permanent planting. I am trying to encourage nasturtiums, borage, nigella and poached egg plants, and I am spreading opium poppy seed about in the hope of more of those.

I get lots of nettles, dandelions, forget-me-nots and grasses from my neighbours, the hedge sends stealth-suckers under the path and the squirrels do try to make sure I get my quota of baby oaks each year...