HARDY ANNUAL Spring/summer bloom Can handle light frost   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. In mild climates, sow in cool fall weather for spring bloom. Space seeds 2 to 3 inches apart in rows 6 inches apart and cover 1/4 inch deep. Or broadcast thinly in a garden bed and cover 1/4 inch deep. Weed young seedlings carefully and thin before they get too crowded. Thin or transplant seedlings 4 to 5 inches apart.   GROWING NOTES Make several successive sowings in early spring to enjoy these carefree old-fashioned flowers throughout spring and early summer. Their delicate blossoms make sweet little bouquets. As flowers fade, cut the decorative seed pods before they mature and split. Hang upside down in bundles out of direct sun to dry for winter bouquets and arrangements. Let some seedpods mature on the plants to spill seed and these graceful flowers will come up year after year.