St John’s Wort is a low-maintenance perennial that thrives in a wide range of garden conditions, especially sunny, dry areas. Recognised for its bright yellow flowers that bloom throughout the summer, this plant is both ornamental and medicinal. It is highly attractive to pollinators, especially native bees, and makes a lovely addition to herb gardens, borders, or wildflower meadows. Once established, it spreads easily by self-seeding and requires little care.
Banned in: Alberta
Where Can You Grow St John's Wort?
This plant grows well in Zones 3–9 and prefers full sun and well-drained soil. It is ideal for rock gardens, drought-prone areas, and perennial borders.
History and Historical Uses
Used for centuries in herbal medicine, St John’s Wort (Hypericum perforatum) was revered in classical Greece for its healing properties. Traditionally applied for a variety of ailments, it has gained modern recognition for its effectiveness in supporting mood balance and treating mild to moderate depression. Its name originates from its historic blooming time around St John’s Day in June.
Canadian Zone Information
Zones 8-9: Direct sow in early spring or late autumn; thrives with minimal watering.
Zones 5-7: Sow in spring after last frost or start indoors and transplant once established.
Zones 3-4: Start indoors 6–8 weeks before last frost and harden off before transplanting.
How to Grow and Harvest St John's Wort
Planting: Sow seeds on surface or lightly press into soil, spacing plants 30–45cm (12–18in) apart.
Watering: Keep moist until established, then reduce watering.
Harvesting: Harvest flowering tops when in full bloom for drying or tinctures.
Maintenance: Cut back after flowering to promote compact growth.
Seed Saving Tips for Future Supply
Allow to Flower and Seed: Let plants mature fully and go to seed.
Harvest Seeds: Collect seed heads once they turn brown and dry.
Dry and Clean: Separate seeds and store in a cool, dry place.
Store: Seeds remain viable for up to 3 years in proper conditions.
Certified Organic By
Islands Organics Producers Association (Cert#1962)
