Dear Miss Chestnuts, Though leeks (like onions) are usually started in February or March indoors for northern gardeners, then set out into the garden in mid- to late spring when they are about pencil-thick or thereabouts, you can technically direct sow them into the garden in early spring, meaning do it at once. Sow a seed a quarter-inch deep or so every couple or 3 inches in the row (spacing rows 18 to 24 inches apart). If you are growing giant leeks, space accordingly (like every 6 inches). I’d play it safe, however, and back myself up with a row of seedlings as well, just in case. M.