1 gram packet ~240–360 seeds, 1⁄16 oz packet ~400–600 seeds; 1 oz, 6,400–9,600. Days to maturity are from date of transplanting.
Culture: Start indoors in Feb. or March and transplant out in spring almost as soon as the ground can be worked. Set 6–12" apart in trenches in well-dug beds with generous quantities of organic matter. Avoid transplanting next to grass strips; slugs love to dine on tiny allium seedlings. Irrigate seedlings whenever the topsoil dries out. Early leeks have tall shanks above ground and should be harvested before severe frosts. Hardier leeks have broader, shorter shanks and will hold till November. Leeks brought into the root cellar will survive almost all winter if heeled into soil. Leek seed is short-lived. Retest 1-year-old seed before using, and discard anything older.
Minimum germination temperature 50°, optimum range 60-70°, optimal temp 68°. Emergence 13 days at 50°, only 5 days at 68°, 99% normal seedlings at 68°.
Diseases: PB: Purple Blotch, PR: Pink Root