White spruce trees can be propagated by taking cuttings or growing them from seed.
From cuttings
Select a healthy branch: Choose a branch with lively growth and a node, which is a bump where leaves or flowers grow.
2. Take the cutting: Use sharp shears to cut the branch just below the node. The cutting should be 4–6 inches long.
3. Prepare the cutting: Remove the lower leaves to expose the node. You can also scrape away some bark from the bottom of the cutting.
4. Apply rooting hormone: Dip the cut end of the cutting into rooting hormone to encourage root growth.
5. Plant the cutting: Put the cutting in a pot with well-draining potting mix. Make sure at least one node is below the surface.
6. Maintain the cutting: Place the pot in a shady area with high humidity and consistent moisture. Wait for roots to develop, which can take several weeks.
From seed
Collect the seeds: Collect seeds from a white spruce tree or from an area with similar growing conditions.
Prepare the soil: Mix a well-draining potting soil with organic matter.
Plant the seeds: Plant the seeds at a depth twice their diameter and space them out.
Maintain the seedlings: Leave the seedlings outdoors over winter. In the fall, bury the pots level with the soil so they receive snow cover.
Plant out the seedlings: When the seedlings are 10–12 inches tall, you can plant them out.