Genus: St. John's wort

Hypericum

Photo/Illustration: 
Steve Silk
St. John's wort (Hypericum)
hy-PARE-ih-kum
Clusiaceae
The more than 400 species of Hypericum are annuals, perennials, shrubs, and trees that are found world-wide in a myriad of habitats. They may be decidous, semi-evergreen, or evergreen.
Noteworthy characteristics:  Various species have attractive autumn color and showy fruit. There is a species for nearly every growing climate and landscape situation.
Care:  Moist but well-drained soil of moderate fertility. Sun and pruning requirements vary by species.
Propagation: 

For perennials, root softwood cuttings in late spring or divide in spring or fall. For shrubs, root greenwood or semi-ripe cuttings in summer. Sow seed in containers in a cold frame in fall.

Problems: 

Thrips, scale, anthracnose, rust, leaf spots.

Species, varieties and clutivars for genus Hypericum

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Tutsan
Hypericum androsaemum 'Albury Purple'
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Aaron's beard
Hypericum calycinum 'Brigadoon'
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St. John's wort
Hypericum frondosum ‘Sunburst’