|Average Seed / oz||Seed / 100′ Row||Average Yield / 100′ Row||Days to Harvest|
|10000||4 gr||150 stalks||135|
|Planting Season||Ideal Soil Temp||Sun||Frost Tolerance|
|All||60-80°F||Full Sun||Very Tolerant|
|Sowing Method||Seed Depth||Direct Seed Spacing||Seeds Per Packet|
|Transplant or Direct Seed||1/4″||1″||300|
|Mature Spacing||Days to Sprout||Production Cycle||Seed Viability|
Leeks are cold hardy biennials that prefer rich, well-drained soil. Amend with compost prior to planting. Plant leeks in full sun.
Leeks can be grown from starts (young plants) or seed. Plant leek starts outdoors as soon as the soil can be worked in late winter-early spring. Space starts 4-6" apart in rows 12" apart. Blanching (preventing a portion of the plant from getting sunlight) is done to create the white, tender portion we most often eat. One planting method involves digging a 6" deep v-shaped trench and filling it with soil as the plants grow taller. The other less labor intensive technique is to poke 6" deep holes and insert leek starts. Soil can then be mounded around the base of plants as they grow. You can also place a portion of cardboard paper towel center around the lower part of the stem for blanching. Keep plants moist until well established and mulch to conserve moisture and minimize weeds.
Plant leek seeds indoors 6-8 weeks before the last frost date or in late summer for overwintering and early spring harvest. Sow seeds 1/4" deep and 1" apart. Seeds germinate best when soil temperatures are between 60-80°F. Seeds will sprout in 6-16 days. Thin seedlings so that mature plants are 4-6" apart. Hardened off seedlings can be transplanted outdoors as soon as the soil can be worked.
Leeks can be harvested on average in 95 days after planting or when plants are large enough to eat.
Leeks are biennial, meaning they flower, set seed and die during their second year of growth. Harvest seed when flowers begin to turn brown. Remove flower head and finish drying indoors. Store seeds in a cool, dry place. Seeds remain viable for 2-4 years.