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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  
Medicinal Rating  
Care
Moist Soil Wet Soil Semi-shade Full sun

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 Jul to August, and the seeds ripen from Aug to September. The flowers are hermaphrodite (have both male and female organs) and are 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.

Synonyms
H. calycatum. H. pusillum.
Hypericum japonicum Matted St. John


Hypericum japonicum Matted St. John
   
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].
Other Uses
None known
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].
                                                                                 
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.
Related Plants                                         
Latin NameCommon NameEdibility RatingMedicinal Rating
Hypericum androsaemumTutsan, Sweet-amber, St. Johnswort01
Hypericum ascyronGreat Saint John's Wort12
Hypericum attenuatum 10
Hypericum bellum 01
Hypericum calycinumRose Of Sharon, Aaron's beard, Creeping Aron's Beard St. Johnswort00
Hypericum erectum 11
Hypericum forrestii 00
Hypericum hypericoidesSt. Andrews Cross02
Hypericum kamtschaticum 10
Hypericum monogynum 02
Hypericum patulumGoldencup St. Johnswort01
Hypericum perforatumSt. John's Wort, Common St. Johnswort24
Hypericum sampsonii 12
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Expert comment                                         
 
      
Author                                         
Thunb.
                                                                                 
Botanical References                                         
58200266
                                                                                 
Links / References                                         
For a list of references used on this page please go here
Readers comment                                         
 
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Subject : Hypericum japonicum  
             
                                        
                                                                                 
                                                                                 
   
 

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