High Desert Plant Finder & Guide

perennial

St John's Wort

Hypericum perforatum

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St John's Wort (Hypericum perforatum) at Moana Nursery

St John's Wort flowers

St John's Wort flowers

(Photo courtesy of NetPS Plant Finder)

Height:  24 inches

Spacing:  14 inches

Sunlight:  full sun  partial shade 

Hardiness Zone:  4

Description:

Tough, rhizomatous, semi-evergreen groundcover with bright yellow, cup-shaped flowers. Makes a good, dense understory. Drought tolerant once established.

Ornamental Features

St John's Wort has masses of beautiful gold star-shaped flowers at the ends of the stems from early to mid summer, which are most effective when planted in groupings. Its narrow leaves remain green in color throughout the season. The fruit is not ornamentally significant.

Landscape Attributes

St John's Wort is an herbaceous perennial with an upright spreading habit of growth. Its relatively fine texture sets it apart from other garden plants with less refined foliage.

This plant will require occasional maintenance and upkeep, and is best cleaned up in early spring before it resumes active growth for the season. It has no significant negative characteristics.

St John's Wort is recommended for the following landscape applications;

  • Groundcover
  • Naturalizing And Woodland Gardens
  • Herb Gardens

Planting & Growing

St John's Wort will grow to be about 24 inches tall at maturity, with a spread of 18 inches. When grown in masses or used as a bedding plant, individual plants should be spaced approximately 14 inches apart. It grows at a medium rate, and under ideal conditions can be expected to live for approximately 5 years.

This plant does best in full sun to partial shade. It prefers to grow in average to dry locations, and dislikes excessive moisture. It is not particular as to soil type or pH. It is highly tolerant of urban pollution and will even thrive in inner city environments. Consider applying a thick mulch around the root zone in both summer and winter to conserve soil moisture and protect it in exposed locations or colder microclimates. This species is not originally from North America.

 
 
Hardiness Zone Plant Height Minimum Sunlight
Characteristics
Groundcover  Naturalizing  Herb 
Applications
Flowers 
Ornamental Features

Please note: Our Plant Guide is all about plants that will work in the high desert. It is not, nor is it intended to be, a current list of plants in stock on hand at each location or at our farm. We purposely do not sell or ship plants via the internet. Plant questions and availability are best determined in-store.