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How to Grow and Care for St. John's Wort - The Spruce
Hypericum - Wikipedia
St. John's Wort: Benefits, Side Effects, Dosage, and Risks
St. John's wort - Mayo Clinic
Hypericum Plant Growing & Care Guide for Gardeners
Hypericum perforatum - Wikipedia
St. John's Wort: Uses, dosage, and risks - Medical News Today
How to Grow St John's Wort | BBC Gardeners World Magazine
Hypericum prolificum - Plant Finder - Missouri Botanical Garden
Saint-John’s-wort | Description, Species, & Uses | Britannica