Winter sow or pre-chill seed.Sow seed on the surface of lightly firmed, moist seed compost in pots or trays. Cover with a fine sprinkling of vermiculite. After sowing, seal container inside a polythene bag and place at a temperature of 15-21C (60-70F) for 3-6 weeks. Then, place the container and bag into a refrigerator (not freezer) for a further 3-6 weeks. After this cold period return container to 15-21C (60-70F). Germination can be slow and erratic
By our calculations, you should look at sowing Blue Lace about 56 days before your last frost date.