A favorite to use as baby greens, 'Red Sails' is ready to harvest after just 2 or 3 weeks and grows to a full head in just over 6 weeks. Very heat tolerant, the soft buttery leaves will grow well into warm weather without getting bitter. 53 days. Up to 10 inches across, the crinkled and deeply fringed leaves are burgundy–turning to medium green at the base. It stands in the garden a long time after maturity without bolting or becoming bitter. Red Sails is an all-time favorite.