(26 days for baby greens, 56 days for full size) Jericho Lettuce Seeds. Silky smooth neon green romaine leaves reach for the sky in this amazing lettuce with origins in the desert. Jericho hails from Israel and is no stranger to the heat. That means this romaine is extremely bolt resistant remaining sweet, tender and crisp under the early summer sun. Approx. 25,000 seeds/ounce.