St. John's Wort

A mixture of herbaceous and woody perennials, Hypericum, is a large genus with over 490 species but only a few have landscape significance. They are mostly valued for their bright yellow flowers that have a long bloom period.



Hypericum androsaemom  
H. ascyron Giant St John's Wort
H. buckfryi  
H. calycinum St John's Wort
H. olympicum  
H. patulum  
H. polyphyllum  

Species Hgt
diameter (in)
Use Flower
H. buckfryi  9-12 -1 Small shrub Old
H. calycinum 15-18 2-3 groundcover Old
H. olympicum  9-12 1-2 groundcover New
H. patulum 18-36 1-2 Medium shrub New
H. polyphyllum  6-12 1-2 Small shrub New

* Guides and Keys are from the book "Herbaceous Perennial Plants A Treatise on their Identification, Culture and Garden Attributes" by Dr Allan M. Armitage of the University of Georgia. Varsity Press, Athens, Georgia. 1989 ISBN 0-942375-00. More on Dr Armitage and his other books.


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