Could this be cauliflower?
My DH was in charge of getting the seedlings going this past winter. We planted brussel sprouts, broccoli, cabbage and cauliflower. He ran out of plastic naming sticks and also possibly got this plant confused with another. The plant in question is the lighter green one. It looks sort of like lettuce, is growing close to the ground and I don't see a head forming yet. The broccoli (or maybe cauliflower) is next to it. Any ideas, I thought cauliflower grew like broccoli.