St. John's Wort (Hypericum calycinum)

General Plant Information (Edit)
Plant Habit:	Shrub
Life cycle:	Perennial
Sun Requirements:	Full Sun to Partial Shade Partial or Dappled Shade Partial Shade to Full Shade
Water Preferences:	Mesic Dry Mesic Dry
Minimum cold hardiness:	Zone 6a -23.3 °C (-10 °F) to -20.6 °C (-5 °F)
Maximum recommended zone:	Zone 10b
Plant Height:	12 inches
Plant Spread:	3-4 feet, but spreads infinitely by stolons
Flowers:	Showy
Flower Color:	Yellow
Flower Time:	Summer Late summer or early fall
Underground structures:	Rhizome
Suitable Locations:	Xeriscapic
Uses:	Erosion control Groundcover Medicinal Herb Will Naturalize
Wildlife Attractant:	Bees
Resistances:	Tolerates dry shade Drought tolerant
Propagation: Seeds:	Self fertile
Propagation: Other methods:	Division Stolons and runners
Pollinators:	Self Various insects
Miscellaneous:	Tolerates poor soil

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Comments:

Posted by zuzu (Northern California - Zone 9a) on May 29, 2014 11:53 PM concerning plant:

I don't know whether this plant is invasive everywhere, but it takes a lot of defensive work in my zone 9 garden to ward off a major invasion by the St. John's Wort growing on my neighbor's property.

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Posted by Mindy03 (Delta KY) on May 9, 2012 6:05 PM concerning plant:

Valuable source of pollen for honey bees.

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Posted by Catmint20906 (PNW WA half hour south of Olympia - Zone 8a) on Aug 23, 2014 7:37 PM concerning plant:

St. John's Wort (Hypericum calycinum) attracts a variety of native bees, including leafcutter, green sweat, sweat, and bumble bees. St. John's Wort also attracts beneficial insects to the garden, such as syrphid flies and banded long-horn beetles, which feed on a variety of common garden pests. This plant has not spread at all in my zone 7a garden, where it is planted in full sun. It may prefer drier soil than the soil common in our area.

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Plant Events from our members
aspenhill	On June 10, 2019	Obtained plant Southern States - qty 2
SuperHappyCamper	On May 6, 2023	Obtained plant Purchased from Odem Nursery in Florence. AL.

Hypericum St. John's Wort (Hypericum calycinum)