Most of my yard is bare soil and mulch (it was a carpet of invasive ivy and blackberries when we moved in, but once removed was too steep and shady for grass to be an option. Revegetating is slow going, but we’re putting in mostly native perennials, which the chickens don’t find delicious). So letting them range just means eating crickets and worms, not greens.
This last month I have been adding calendula flowers to their morning mash but it’s awfully labor intensive for the results.
And although I feel embarrassed about it, I actually fill bags up with greens that I nab from the local grocery store’s compost bin. But that is also labor intensive and not something I can get around to more than once every week or two. They eat a three gallon bag down in like 15 minutes and don’t even say thank you!