From our Edible Gardens LA organic gardens, assorted poppy seed heads holding hundreds of seeds inside in several rare and exotic varieties. Allow seed heads to dry indoors in a vase or bowl. When ready to plant seeds, open these seed heads over a large bowl so all seeds are collected. These are a cool season flower. Sow seeds outdoors in early spring in colder regions or in the fall in warmer climates. Barely cover with soil and water well.