Early lettuce seed Blue Rock

powdery mildew resistantsummerhybrid

New! Classic romaine with modern disease resistance. Attractive, dark green savoy leaves on tall, upright heads that fill out nicely and remain partially open when mature. Slow-bolting plants with a low core can hold their weight well and are ideal marketed as whole heads. An improvement over Coastal Star in bolt tolerance, disease resistance, weight, and color. High resistance to downy mildew races EU 21, 22, 26, 30, 31; US 7–9, Nasonovia ribisnigri aphid, and tomato bushy stunt virus. MT0-30. USDA Certified Organic. Avg. 567,500 seeds/lb. Packet: 500 seeds. GROWING INFORMATION SCIENTIFIC NAME: Lactuca sativa CULTURE: Lettuce is a hardy, cool-weather crop and can be planted with your earliest worked soil. It grows best at 60–65°F (16–18°C) and germinates best below 70°F (21°C), so careful variety selection is key for success in hotter weather. Sow every 2–3 weeks for a continuous supply of either full heads or salad mix. THERMAL DORMANCY: Lettuce seed can enter thermal dormancy when exposed to high temperatures. Optimum germination results at soil temperatures of 60-68°F (16-20°C). The priming process in pelleted lettuce seeds broadens the temperature range in which the seeds will germinate, overcoming some of their thermal dormancy.