St. John’s wort can be propagated by seed, root division, layering, or stem cuttings.
Seed propagation
- Collect the berries or capsules in the fall.
- Let the capsules dry at room temperature for a few weeks.
- Break open the berries to release the seeds.
- Store the seeds in a cool, dry, dark place.
- In spring, sow the seeds in a sandy soil mixture.
- Keep the soil moist and in a warm place with bright, indirect light.
- After the seedlings have a couple of pairs of leaves, thin or transplant them.
Stem cutting propagation
- Select a 4–6 inch stem from a healthy part of the plant.
- Cut the stem just above a leaf bud.
- Remove the leaves from the lower half of the stem.
- Dip the cut end in rooting hormone.
- Place the cutting in a container with damp potting soil.
- Keep the soil moist.
- Place the container in a warm area with bright, indirect light.
- Once the cutting has rooted, transplant it to a new container or outside.
St. John’s wort is easy to grow and can tolerate a wide range of conditions.