Brief Summary
provided by Ecomare
Common St John's wort starts to blossom around the feast of St. John on June 24. The flowers blossom one at a time and for 2 or 3 days only. It blossoms late in the season and continues to produce flowers into September. Extracts of this plant are widely used in herbal medicines and creams. If you hold a leaf against the light, you will see what looks like perforations. They are oil glands! To distinguish between other plants in this family, try crushing a flower or seed pod: if a red-purple liquid appears, it is common St. John's wort.
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