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  5. Creeping St Johns Wort - Hypericum calycinum
Creeping St Johns Wort - Hypericum calycinum
St John's Wort is a groundcover plant that produces very unique and beautiful, large, saucer-shape yellow flowers that have bushy center stamens with reddish anthers. The flowers cover the plant in summer. Scroll down for more details!

Creeping St Johns Wort - Hypericum calycinum

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Creeping St John's Wort
Hypericum calycinum

USDA Plant Hardiness Zones: 5a-8b  Find Your Zone >



Special Attributes

St John's Wort, Hypericum calycinum, sometimes called Aaron's Beard, is a stoloniferous groundcover plant that produces very unique and beautiful, large, saucer-shape yellow flowers with bushy center stamens and reddish anthers. The flowers appear singly or in groups of 2-3 and cover the plant in summer. Oval to oblong leaves (to 4" long) are rich green in sun but are a lighter, yellowish green in shade. This species has been used since ancient times in the treatment of wounds and was apparently gathered and burned to ward off evil spirits on the eve of St. John's Day, thus giving rise to the genus common name of St. John's Wort.

Allan Armitage calls this "one of the finest groundcover plants available!"




Landscape & Garden Uses

Growing 8 to 12 inches tall and spreading to 24 inches or more, Creeping St John's Wort is ideal for use as an attractive small or large space groundcover. Since plants spread from underground stolons it's a good idea to use a root barrier/edging material to contain the plant in smaller spaces. Excellent for use as a border along paths and walkways, as an underplanting for small trees, in naturalized plantings, and in mixed container gardens. It is also good for stabilizing and controlling erosion on embankments or hillsides. A fine addition to Xeriscape gardens (low water needs). 




Cultural Preferences

St John's Wort is easy to grow and maintain in a wide range of conditions. It flourishes in most any average, moist to dry well-drained soil in full sun to part shade. It really thrives on sandy soils in full sun. The plant is less floriferous in part shade. In warm winter climates the plant will be evergreen. It usually dies to the ground or suffers some tip dieback in cold winter climates, but blooms on new growth and comes back nicely each spring. In areas where it does not die in winter, shear or mow plants in late winter or early spring every 2-3 years to renew and induce new growth. 


NOTE:  Find helpful advice under the Planting & Care tab above on desktops and below on mobile phones.




Plant Details & Attributes

USDA Plant Hardiness Zones: 5a-8b  Find Your Zone >
Plant Type:  Groundcover
Height or Length at Maturity:  12"
Width at Maturity:  24" +
Spacing:  15" apart for mass planting groundcover
Growth Habit / Form:  Spreading/Trailing
Growth Rate:  Moderate to Fast
Flower Color:  BRIGHT Yellow 
Flower Type:  Single
Flower Size:  2-3" diameter
Flowering Period:  Summer
Fragrant Flowers:  NA
Foliage Color: Rich Green in sun, Light Green in shade
Fragrant Foliage:  No
Berries:  No
Sun Needs:  Full Sun to Part Shade
Water Needs:  Average, very low when established
Soil Type:  Clay, Loam, Sand, Silt
Soil Drainage:  Well Drained
Soil pH:  6 - 7.5
Maintenance / Care:  Low, mow after winter if necessary to tidy plants
Attracts:  Visual attention in flower!
Resistances:  Deer, Disease, Drought, Dry Soil, Heat, Humidity, Insect



Plant Long & Prosper!

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