• Botanical name: Hypericum perforatum
  • Common names: St. John’s wort, Hypericum
  • Planting: Spring or Autumn
  • Flowering: Summer
  • Exposure: Sunny or semi-shady
  • Soil: Loose and deep
  • Height: 5 cm to 1.50 m

St. John’s wort in the garden

It is an excellent groundcover, a formidable competitor to weeds. The shrub species are used in low hedges or in flower beds.

It can also be used to stabilize sloping soils prone to erosion and to plant a slope. It can also be grown in pots, but these should be large.

Combine St. wort with variegated dogwood to ensure the volume of the bouquet with its branches. Add dahlias, lilies, hydrangeas, daisies, sunflowers, and zinnias.

How to grow St. John’s wort

The ideal time to grow St. John’s Wort is in the fall. This encourages rooting. It is possible to plant it in early spring, but this will require generous and regular watering, especially if the weather becomes warmer and warmer.

It is not difficult in terms of soil condition, but ideally, it should be well-drained and rich in nutrients. If your soil is poor, don’t worry, the plant will continue to grow. Prefers a sunny location, but most species tolerate all exposures.

To plant, just follow the same technique as for most shrubs, that is, plant in a hole two to three times the size of the root ball (roots), add a little compost to it, and then cover the roots well with soil. garden, finally irrigated with plenty of water.

We recommend covering the soil at the foot of the plant with a good layer of organic mulch, to protect it from the sun and protect its moisture for longer. Remember also that the cultivation should be done in the afternoon when the sun is not giving directions on the place, this will help the plant not to suffer and recover faster.

Maintenance of St. John’s wort

It is particularly hardy as it can withstand temperatures as low as -15 ° C. Flowering takes place throughout the summer, but maintenance pruning is necessary to stimulate it.

Pruning takes place in late winter or early spring. Also, remember to remove dry leaves and wilted flowers as you go. Every two or three years you can prune a little more severely to give it a better shape.

When it comes to irrigation, it survives very well on its own. Only potted plants need to be watered.


It is sometimes susceptible to fungus, especially if the weather is hot and humid. The underside of the leaves then shows orange-brown pustules, the foliage acquires a rusty tone and falls prematurely. Collect the diseased leaves and burn them, for their treatment apply Bordeaux mixture, this is a very good and effective fungicide.

Properties of St. John’s Wort

It (Hypericum perforatum) is known for its medicinal virtues. In particular, it is used in the preparation of herbal remedies to treat depression and mood disorders.

In the Middle Ages, it was already used to treat mild depressions, hence its nickname “devil’s hunt.” St. John’s is also used as an essential oil to fight acne, eczema, bedsores, burns, and stings.

Read also: How to grow strawflowers