14-inch tops make good greens.  Heirloom varieties introduced in 1892. 

Contains approx. 100 heirloom seeds

Planting Instructions:  Seeds can be sown in cool or warm conditions, covered very lightly (depth of ½  inch) and kept reasonably moist until seedlings emerge. 

To hasten germination, soak seeds for 8 to 24 hours before sowing.