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Hypericum japonicum - Thunb.                
                 
Common Name Matted St. John's Wort
Family Hypericaceae
Synonyms H. calycatum. H. pusillum.
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.


USDA hardiness zone : Coming soon


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.

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.
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Expert comment                                         
 
      
Author                                         
Thunb.
                                                                                 
Botanical References                                         
58200266
                                                                                 
Links / References                                         

[1]F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956
Comprehensive listing of species and how to grow them. Somewhat outdated, it has been replaces in 1992 by a new dictionary (see [200]).
[147]? A Barefoot Doctors Manual.
A very readable herbal from China, combining some modern methods with traditional chinese methods.
[218]Duke. J. A. and Ayensu. E. S. Medicinal Plants of China
Details of over 1,200 medicinal plants of China and brief details of their uses. Often includes an analysis, or at least a list of constituents. Heavy going if you are not into the subject.
[240]Chopra. R. N., Nayar. S. L. and Chopra. I. C. Glossary of Indian Medicinal Plants (Including the Supplement).
Very terse details of medicinal uses of plants with a wide range of references and details of research into the plants chemistry. Not for the casual reader.
[266] Flora of China
On-line version of the Flora - an excellent resource giving basic info on habitat and some uses.
[272]Manandhar. N. P. Plants and People of Nepal
Excellent book, covering over 1,500 species of useful plants from Nepal together with information on the geography and peoples of Nepal. Good descriptions of the plants with terse notes on their uses.

Readers comment                                         
 
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Subject : Hypericum japonicum  
             

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