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Harvest flowers: Leeks are biennials and will not make seed their first year. Therefore, either store roots in a root cellar during the winter, or protect from extreme winter conditions outside. In spring, it may be helpful to do some stalking in order to support the seed stalks. Harvest seed heads when about half of the pods are open, revealing black seeds.
Dry seed heads: Allow seed heads to dry inside. Then shake seeds out, onto a screen. Remove chaff by applying a light breeze. Allow seeds to dry in a moisture free and cool environment for 2-3 weeks.
Label and Store: Leek seeds can last 1-3 years.
Leeks do well in nutritious soil with a pH of 6.2-6.8 that is well drained. They should be grown in partial shade, and do best in cool to moderate climates.
Growers interested in saving seeds need to be conscious of the distance between leek varieties. Leeks are insect-pollinated and require 1500 meters separation.
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