You can start early in pots, or direct sow in spring, but they require a short cold treatment to germinate fully. Mix your seeds with 1 cup of sand or peat and add 1/4 cup of water so your mixture is moist but not soggy. Place in your refrigerator (not freezer) for 30 days. Let your mix dry out on the counter and sow. But please note that winter started or spring sown Wallflower seeds will generally not flower in the first year.
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