Dense, heavy heads and good field holding make this all-season red leaf a reliable standard. Ruffled leaves are intense purple-red at the tips, and green at the inner base. Compared to Vulcan, Ruby Sky has similar flavor and good tolerance to bottom rot. Uniform, with a smaller overall frame. Slower growing and slower bolting than Vulcan. Utility Patent granted. High resistance to downy mildew races EU 16, 17, 21, 23, 32, US 5–6 and Nasonovia ribisnigri aphid; and intermediate resistance to lettuce mosaic virus. MT0-30. Avg. 1,100 seeds/oz. Packet: 250 seeds.