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Hypericum japonicum


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Hypericum japonicum

Elements of Structural and Systematic Botany

B and T World Seeds' Botanical Glossary

B and T World Seeds' reference number: 400702

Type of plant - annual
Flower or inflorescence: YELLOW - ORANGE, 4-8mm. dia., stellate
Foliage: broad ovate, 2-18mm. wide
Height, in meters: 0.5
Height, in feet: 1.65
Hypericum japonicum sales history
Parts of Hypericum japonicum are considered toxic.

Synonyms (alternative names) for Hypericum japonicum:
Hypericum chinense, Triadenum japonicum, 

Common names for Hypericum japonicum:

Matted St. John's Wort, 


Hypericum japonicum is included in the following
B and T World Seeds flowering plant categories.

15:   Australian Natives and Introduced Species
23:   New Zealand Natives and Introduced Species
38:   Indian Native and Introduced Plants
50:   Japanese Native and Introduced Plants
51:   Chinese Native and Introduced Plants
53:   Bedding Plant Seed List
72:   Russian Native and Introduced Plants (Central)
73:   East Asian Native and Introduced Plants
131:   Toxic Plants
Some of the deadliest known poisons are found in plants. Some major food plants, eaten by millions of people every day, have toxic parts.
314:  Clusiaceae
437:  Hypericaceae
710:  Guttiferae


Happier and Healthier Plants, Naturally

plant-fungus communities, for improved nutrition, and disease and drought resistance.


Germination guide for Hypericum japonicum

These notes are a general guide, it is recommended to check specialist literature for some of the more unusual seeds in our lists.
Seed Germination Theory and Practice by Professor Norman C. Deno
Some knowledge about growing from seed is necessary to germinate even the easiest seeds. Most seeds require humidity to germinate, even desert plants like Welwitschia mirabilis require that their growing medium remains moist until germination.

Most seeds require oxygen to germinate, if buried too deep in their growing medium, or if the medium is too wet, the seeds may not get the oxygen they require.
Some seeds need to be in the light (surface sown) or in the dark (sown deep enough to receive little or no light) to germinate. A rule of thumb is to cover the seeds their own width deep in the growing medium, but some seeds prefer to be sown much deeper, and some fairly large seeds like to be surface sown (or higher).
Many seeds germinate best at certain temperatures, some will germinate at a comparatively wide range of temperatures, yet others need fluctuating temperatures.
Almost all seeds are waiting in a dormant state for some outside stimulus to break their dormancy, some just need sufficiently high ambiant humidity, others need scarification, vernalization or to be passed through the intestines of an animal.

Hypericum japonicum seeds will usually germinate in 30-90 days, even under good conditions germination may be erratic.
Sow Hypericum japonicum seeds about 1mm deep in a Well drained seed sowing mix at about 10°C.


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