Merveille is a French butterhead-type heirloom dating back to the 19th century. It can be translated as "marvel of the four seasons". The green outer leaves are tipped with a deep red, surrounding a tightly-folded green heart. Great for early spring and late fall planting. Develops a wonder sweetness when subject to cool weather. If you grow in an area with prolonged cool weather Merveille des Quatre is a great variety. 58 Days butterhead, 30 days baby.