When to Pot Allium Seeds

Written by eulalia palomo
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When to Pot Allium Seeds
The large, showy seedheads produce hundreds of tiny seeds in the fall. (Medioimages/Photodisc/Photodisc/Getty Images)

Alliums have showy purple flower heads that cover the garden and wild areas in spring. More commonly known as the wild onion, alliums grow naturally in damp mountainous areas of the United States. Pot up allium seeds in the fall for spring planting, or store the seeds overwinter to pot up in the spring. When planting allium seeds, timing is important for germination success.

Collecting Allium Seeds

There are two ways to obtain allium seeds for potting. Either purchase them from a seed company or collect your own from the garden. Collect allium seeds in the fall when the flower heads begin to dry on the plant. Cut the flower heads from the plant and shake the seeds into a bag or bucket. Replant the seeds within a few weeks of collecting or store the allium seeds for the winter. A jar with a tight-fitting lid in the back of the refrigerator makes a good storage solution.

Potting up Allium Seeds

Use a seed-starting flat or individual 2-inch pots or cell packs. If you have a bunch of larger planting pots around, use those and plant multiple seeds in each pot. Use seed-starting compost or seed-starting mix to germinate allium seeds. A sterile seed-starting mix made from equal parts peat, sterile compost and coarse grit works well. Fill the seed flat or pots with the damp mixture and level off the top. Plant the allium seeds 1/4 deep and 1 inch apart.

Fall Planting

Replant the seeds in the fall within a few weeks of harvesting. Place the pots outdoors in mild climates or, in cold climates, keep the pots in a cool greenhouse. The seeds should be kept cool but not frozen. Keep the soil in the pots between 1.67 and 4.44 degrees C for the winter months. The allium seeds will go through a natural chilling process during the winter and will germinate in the spring.

Spring Planting

Remove the allium seeds from the refrigerator in the spring. The seeds go through the necessary cool period in storage and are ready to germinate once they are potted up. Plant the allium seeds in pots and place the pots where the soil temperature will remain at or slightly above 55F. Keep the soil damp around the seeds. Look for new, green seedlings 10 to 12 weeks after planting.

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