Once your delphinium flowers have all bloomed and gone away, it is time to cut the plant’s stalks to the ground. Hang the stalks, which include the green seed pods, in a spot to dry. After a few weeks, you will notice that the pods begin to brown and split. You can also hear the seeds moving around inside the pods if you give the stalk a shake. Break open the pods to remove the tiny seeds and then store them in an air-tight container or zippered plastic bag in your refrigerator over the winter. Delphinium seeds need a cold period over the winter for spring germination. You can start the seeds indoors 8 to 10 weeks before the last frost.
Once your delphinium flowers have all bloomed and gone away, it is time to cut the plant’s stalks to the ground. Hang the stalks, which include the green seed pods, in a spot to dry. After a few weeks, you will notice that the pods begin to brown and split. You can also hear the seeds moving around inside the pods if you give the stalk a shake. Break open the pods to remove the tiny seeds and then store them in an air-tight container or zippered plastic bag in your refrigerator over the winter. Delphinium seeds need a cold period over the winter for spring germination. You can start the seeds indoors 8 to 10 weeks before the last frost.