St. Johns Wort
Hypericum calycinum
St. Johns Wort
Hypericum calycinum
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- Hypericum calycinum, commonly known as St. John’s Wort, is a tough and dependable groundcover that brings bright color and dense coverage to the landscape. It is especially valued for its large, golden yellow flowers that appear in late spring through summer, each one accented with a burst of showy stamens that give the blooms a soft, almost fuzzy look.
- The foliage is a deep green and forms a thick, low growing mat that spreads steadily over time. It works well for covering slopes, filling in difficult areas, or suppressing weeds in garden beds. Its dense growth habit makes it a practical choice for both residential and commercial landscapes where low maintenance coverage is needed.
- Hypericum calycinum performs best in full sun to partial shade and adapts to a wide range of soil conditions as long as there is decent drainage. Once established, it is drought tolerant, though it will look fuller and more vigorous with occasional watering during extended dry periods.
- This plant typically grows about 1 to 2 feet tall and spreads 3 to 5 feet or more, creating a broad, carpet like effect. It can be cut back hard if needed to refresh growth and maintain a more compact appearance.
- It is well suited for USDA zones 5 through 9 and is known for its durability in a variety of climates.
- Hypericum calycinum is considered mildly toxic if ingested, so it is best to use some caution around pets and small children.
- With its bright flowers, hardy nature, and ability to cover ground quickly, St. John’s Wort is a reliable solution for adding color and function to the garden.
Foliage:
Evergreen,
Semi-deciduous
Mature Height:
1-2'
Mature Width:
4-5'
Attributes:
Drought Tolerant,
Erosion Control
Proper planting technique will help your plants thrive! Follow these simple steps to help your plants establish quickly, develop a strong root system, and live longer:
- Properly dig the hole
- Amend the soil to suit each particular plant
- Place the plant and backfill the soil
- Provide ample water for each particular plant
- Review our how to plant guide!
For detailed information, please download our planting guides: