In mild winter climates plants sown in midsummer (late July to mid August) develop throughout late summer and early autumn to flower abundantly the following spring.
In cold winter areas very early spring planting is fine. Forget-Me-Nots will naturalize easily. Pull out plants when bloom is finished and shake seed out if you want them to naturalize on their own.
EASIEST TO PLANT DIRECTLY IN THE GARDEN
Sow seeds directly into a finely textured, well-drained garden bed as early in spring as the ground can be worked, or in mid-summer where winters have only light frosts. Space seeds 2 to 3 inches apart and cover 1/4 inch deep. Keep soil moist as seedlings emerge in 7 to 14 days. Weed young seedlings carefully and thin before they get too crowded for best displays of flowers.