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Hypericum japonicum - Thunb.

Common Name Matted St. John's Wort
Family Hypericaceae
USDA hardiness Coming soon
Known Hazards The plant is suspected of causing photo-sensitization[240]. Feeding trials to livestock in New Zealand have shown that it is non-toxic[240].
Habitats Wet places in lowland, C. and S. Japan. Rice fields, ditches, marshes, grasslands and waste places from sea level to around 3000 metres[266].
Range E. Asia - China, Japan to Australia and New Zealand.
Edibility Rating    (0 of 5)
Other Uses    (0 of 5)
Weed Potential No
Medicinal Rating    (2 of 5)
Care
Moist Soil Wet Soil Semi-shade Full sun
Hypericum japonicum Matted St. John


Hypericum japonicum Matted St. John

 

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Summary


Physical Characteristics

 icon of manicon of flower
Hypericum japonicum is a ANNUAL/PERENNIAL growing to 0.5 m (1ft 8in). It is in flower from July to August, and the seeds ripen from August to September. The species is hermaphrodite (has both male and female organs) and is pollinated by Insects. The plant is self-fertile.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist or wet soil.

UK Hardiness Map US Hardiness Map

Synonyms

H. calycatum. H. pusillum.

Habitats

 Bog Garden;

Edible Uses

None known

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.
Antiphlogistic  Depurative  Febrifuge  Vulnerary

The plant is alterative, antiphlogistic, astringent, depurative, febrifuge and vulnerary[147, 218, 240]. It is decocted with water for use[218]. It is used in the treatment of asthma and dysentery, acute hepatitis, pain in the liver region, appendicitis, boils and abscesses and has also been used as a styptic[147, 240, 272]. The plant has also shown antitumour activity[218].

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Other Uses

None known

Special Uses

Cultivation details

Easily grown in any reasonably good well-drained but moisture retentive soil[1]. Succeeds in sun or semi-shade but flowers better in a sunny position. This species is found in the wild in wet soils. A very variable species[266].

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Propagation

Seed - sow spring in a cold frame. When they are large enough to handle, prick the seedlings out into individual pots and plant them out in late spring. It might also be worthwhile trying an outdoor sowing in April.

Other Names

If available other names are mentioned here

Found In

Countries where the plant has been found are listed here if the information is available

Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.

Conservation Status

IUCN Red List of Threatened Plants Status :

Related Plants
Latin NameCommon NameHabitHeightHardinessGrowthSoilShadeMoistureEdibleMedicinalOther
Hypericum androsaemumTutsan, Sweet-amber, St. JohnswortShrub1.0 5-10 FLMHSNDM01 
Hypericum ascyronGreat Saint John's WortPerennial1.5 3-7  LMHSNM12 
Hypericum attenuatum Perennial0.6 -  LMHSNDM10 
Hypericum bellum Shrub1.0 5-9  LMHSNM01 
Hypericum calycinumRose Of Sharon, Aaron's beard, Creeping Aron's Beard St. JohnswortShrub0.3 5-10 FLMHFSNDM00 
Hypericum erectum Perennial0.6 5-9  LMHSNM11 
Hypericum forrestii Shrub2.0 4-8  LMHSNM00 
Hypericum hypericoidesSt. Andrews CrossShrub1.2 5-9  LMSNDM02 
Hypericum kamtschaticum Perennial0.3 -  LMHSNM10 
Hypericum monogynum Shrub0.7 8-11  LMHSNM02 
Hypericum patulumGoldencup St. JohnswortShrub1.0 6-7 MLMHSNM01 
Hypericum perforatumSt. John's Wort, Common St. JohnswortPerennial0.9 3-7  LMHSNM240
Hypericum sampsonii Perennial0.6 8-11  LMHSNM12 

 

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Author

Thunb.

Botanical References

58200266

Links / References

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