How do you grow blue spruce trees from cones?

To grow blue spruce trees from cones, first collect mature cones in late summer or early fall. Allow the cones to dry in a warm, dry place until they open and release the seeds. Then, stratify the seeds by placing them in a moist medium in the refrigerator for about 30 days to simulate winter conditions. Finally, sow the seeds in a well-draining potting mix, keeping them moist and in a sunny location until they germinate.