Plant of the Month for Louisville CO area landscapes-December 2021

St. John’s Wort

Louisville, CO area landscapes {Plant of the Month Series}

St. John’s Wort, or Hypericum frondosum is a woody shrub about 3-4’ high and wide that grows readily in North America. It is native to the southeastern United States. It has small showy yellow flowers and abundant blue tinged to green foliage. It blooms mostly in early to mid summer in our Louisville Colorado landscapes. It is not an evergreen shrub in the Colorado climate. ‘Sunburst’ is a popular cultivar that has slightly larger flowers. It is deer and rabbit resistant. It prefers a loamy to sandy soil, but can handle the more clay soils with some amendments. It will take full sun, but prefers some filtered shade, or at least shade from the intense late afternoon sun. It is a moderate water user. It has been used extensively in landscapes since the early 1800’s.

Use Golden St. John’s Wort as a foundation planting to soften the starkness of a building and to add color. Use it as a hedge, or as a single showy specimen plant. There is some winter dieback, but it is usually minimal. Pruning is not generally needed, except to remove winter-kill. Find a partial shade spot and plant a few. They look great and are easy to grow.

Some photos by Keith Williamson’s from Little Valley Wholesale Nursery

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