The lettuce at the back is Martha Stewart's organic lettuce mix. It germinated the fastest and is a superb mix of mild lettuce greens ( I think it contains one type of mustard green). The purple lettuce is Urban Harvests Red Bowl lettuce. It was slower to germinate and to grow but tastes amazing. I'm going to continue cutting from these rows until the lettuce becomes bitter and then I will re-seed. I'm noticing that this bed along the side of my fence gets some strong afternoon sun. Some of the Martha Stewart lettuce has started going to seed. It's bolting! oh no!