How to Grow Hypericum Moserianum - Plant Care & Tips

By NorwichGardener Team   /   2024

Hypericum moserianum is an evergreen, herbaceous plant that is native to the Balkan Peninsula. The leaves are opposite, ovate to lanceolate, and measure 2–5 cm long and 1–2 cm wide. The flowers are yellow, with 5 petals and 10 stamens, and appear in July and August. The fruit is a capsule that contains numerous small seeds.

How to Grow Hypericum Moserianum - Plant Care & Tips

Also known as

  • Saint John's-wort
  • Klamath weed
  • Tutsan
  • Rose of Sharon
  • Hypericum

Common Knowledge

  • Hypericum moserianum, also known as St. John's Wort, is a flowering plant in the family Hypericaceae.
  • The plant is native to Europe, but has been naturalized in North America and other parts of the world.
  • The flowers of the plant are typically yellow, but can range in color from white to pink.
  • The plant is often used as an herbal remedy for depression and anxiety.
  • Clinical studies have shown that St. John's Wort is effective in treating mild to moderate depression.
  • The mechanisms by which St. John's Wort works are not fully understood, but it is thought to increase levels of serotonin and other neurotransmitters in the brain.
  • St. John's Wort can cause photosensitivity, so it is important to avoid direct sunlight while taking the herb.
  • The herb can also interact with other medications, so it is important to speak to a healthcare provider before taking St. John's Wort.
  • Side effects of St. John's Wort include gastrointestinal upset, dry mouth, and fatigue.
  • St. John's Wort is generally considered safe for most people, but should be used with caution in people with underlying medical conditions.

Planting Process

  1. For hypericum moserianum, first step is to sow the seed in late winter or early spring.
  2. Sow the seed on the surface of the soil and press it gently into the soil.
  3. Water the seed lightly and keep the soil moist.
  4. The seed will germinate in 14-21 days.
  5. When the seedlings are large enough to handle, transplant them into individual pots.
  6. Grow the seedlings in a sunny location.
  7. Water the plants regularly and fertilize them monthly.
  8. In late summer or early fall, transplant the seedlings into the garden.
  9. Hypericum moserianum will bloom in late summer.
  10. Enjoy your beautiful blooms!

Related plant:
Hypericum Shrub

Soil Requirement

About soil condition, hypericum moserianum needs well-drained soil, and prefer sandy or gravelly, neutral to slightly alkaline soil. They are not very fussy about soil type as long as it is not waterlogged.

About light

Like the other Hypericum species, Hypericum moserianum enjoys full sun to partial shade. In fact, it thrives in sunny locations and produces the most flowers when it gets plenty of sun. However, it will also tolerate some shade, especially in hot summer climates. It's a good idea to give this plant a little afternoon shade in hot weather to prevent the flowers from fading.

Ideal Temperature

The temperature condition that is most favorable for the growth of Hypericum moserianum is a temperature range of 20 to 25 degrees Celsius. This temperature range is optimal for the growth and development of this plant species. Above or below this temperature range, the growth of Hypericum moserianum is significantly inhibited.

Humidity Level

Ideal humidity condition for this plant is 50% or less. While 50% humidity is the ideal, this plant can tolerate up to 60% without any problems. If the humidity gets any higher than that, the leaves will start to turn yellow and drop off.


For the fertilizer, this family of plant is not too particular and anything from 5-10-5 to 10-10-10 will work just fine. The best way to apply the fertilizer is to scatter it around the base of the plant and then work it into the top couple of inches of the soil. As for the roots, they like to be well-drained and on the sandy side so if your soil is on the heavy side, you might want to consider adding some sand to the planting hole.

Light requirement

Pruning your Hypericum Moserianum is essential to keeping the plant healthy and strong. Remove any dead or dying branches as well as any branches that are crossing over each other. This will help to promote new growth and keep the plant looking its best.

The Propagation

Propagation of Hypericum moserianum is typically done through seed, although cuttings can also be taken from new growth. Seed should be sown in a sterile, well-draining medium and kept at a temperature of 18-21°C (65-70°F). Cuttings should be taken from new growth, using a sharp knife or pruners, and rooting hormone can be applied to the cut ends to encourage root development. Cuttings should be placed in a sterile, well-draining medium and kept at a temperature of 18-21°C (65-70°F).

Growth Rate

Usually, the plant growth rate is about 5 to 10 centimeters a year. However, some individuals may grow at about 2.5 centimeters a year while others may grow rapidly at about 15 centimeters a year. The average size of a mature hypericum moserianum is about 30 centimeters.

The Problems

Common problems for this kind of plant are lack of flowering, excessive leaf drop, and dieback. To encourage flowering, give the plant plenty of sunlight and well-drained soil. To reduce leaf drop, water the plant deeply but infrequently. And to prevent dieback, prune the plant regularly to encourage new growth.

Basics of Growing

  • Do not forget to water your plant regularly. The plant needs a lot of water, so water it deeply and often.
  • Place your plant in a sunny spot. The plant needs a lot of light to grow well.
  • Apply a balanced fertilizer to your plant monthly.
  • Prune your plant regularly to encourage new growth.
  • Keep an eye out for pests and diseases. Treat your plant promptly if you notice any problems.
  • Harvest the plant's flowers regularly. Cut the stems back after flowering to encourage new growth.
  • Divide your plant every few years to keep it healthy.
  • Protect your plant from extreme temperatures. The plant can tolerate some cold, but it is not frost hardy.
  • Mulch your plant to help retain moisture.
  • Enjoy your beautiful plant!

Similar Plants

  • Thalictrum aquilegiifolium (columbine meadow-rue)
  • Asteroconion vietinghoffii (Vietinghoff's aster)
  • Desmodium stevensii (Stevens' tick-trefoil)
  • Salix hintonii (Hinton's willow)
  • Arendtia stenocarpa (slender-fruited arendtia)
  • Meehania cordata (heart-leaved meehania)
  • Luina calycina (calyx luina)
  • Blepharocalyx salicifolius (willow-leaved blepharocalyx)
  • Galium tricornutum (three-horned clearweed)
  • Adesmia micrantha (miniature flowered adesmia

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Reviewed & Published by Richelle
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Herbs Category