Name: Tom Thumb Lettuce Botanical Name: Lactuca sativa Type: Heirloom Butterhead Size at Maturity: 5" Head Days to Maturity: 55-60 Days Light Requirement: Sun/Partial Shade Planting Time: Cool Season Sowing Method: Direct Sow Planting Depth: 1/8" Plant Spacing: 6" Hardiness Zones: All