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St. John's Wort: The Ultimate Companion Plant for Your Garden

st john's wort companion planting

The Benefits of St. John's Wort Companion Planting

St. John's Wort is an herbaceous plant that has been used for centuries for its medicinal properties. It's also a great companion plant for a variety of reasons.

First, St. John's Wort attracts pollinators like bees and butterflies to your garden. This can increase the yield of crops that require pollination. Second, it repels certain pests like aphids and spider mites, which can damage or destroy plants. Finally, St. John's Wort has allelopathic properties, meaning it releases chemicals that inhibit the growth of nearby weeds.

How to Grow St. John's Wort

St. John's Wort is a hardy plant that can grow in a variety of soil types, from sandy to clay. It prefers full sun but can also tolerate partial shade. The plant grows up to three feet tall and produces yellow flowers in the summer.

To grow St. John's Wort, by purchasing seeds or seedlings from a local garden center or online retailer. Plant them in well-draining soil with a pH between 6.0 and 7.5. Water regularly to keep the soil moist but not waterlogged.

Companion Plants for St. John's Wort

St. John's Wort pairs well with a variety of plants. Here are a few suggestions:

  • Lavender: Lavender and St. John's Wort both attract pollinators.
  • Tomatoes: St. John's Wort repels aphids, which can damage tomato plants.
  • Peppers: St. John's Wort repels spider mites, which can damage pepper plants.

Companion Planting Tips

When planting St. John's Wort and its companion plants, keep these tips in mind:

  • Plant St. John's Wort in the center of the bed to maximize its allelopathic properties.
  • Plant companion plants around the perimeter of the bed.
  • Leave enough space between plants to allow for air circulation and prevent overcrowding.

The Medicinal Properties of St. John's Wort

St. John's Wort is also known for its medicinal properties. It's been used to treat a variety of ailments, from depression to skin conditions.


St. John's Wort has been shown to be an effective treatment for mild to moderate depression. It works by increasing the levels of serotonin, dopamine, and norepinephrine in the brain, which can improve mood.


St. John's Wort may also be effective in treating anxiety. It works by reducing the levels of cortisol, a hormone that's released in response to stress.

Skin Conditions

St. John's Wort has anti-inflammatory and antibacterial properties, which make it effective in treating skin conditions like eczema and acne.

St. John's Wort Precautions

While St. John's Wort has many benefits, it's important to use it safely. Here are a few precautions to keep in mind:

Drug Interactions

St. John's Wort can interact with certain medications, including antidepressants, birth control pills, and blood thinners. If you're taking any medication, talk to your doctor before using St. John's Wort.

Sun Sensitivity

St. John's Wort can make your skin more sensitive to the sun. If you're using St. John's Wort topically, be sure to wear sunscreen and protective clothing when going outside.

Side Effects

St. John's Wort can cause side effects like dry mouth, dizziness, and gastrointestinal symptoms. If you experience any of these symptoms, stop using St. John's Wort and talk to your doctor.


Q: Can I grow St. John's Wort indoors?

A: Yes, St. John's Wort can be grown indoors in a sunny window.

Q: Can I use St. John's Wort for anxiety?

A: St. John's Wort may be effective in treating anxiety, but it's important to talk to your doctor before using it.

Q: How do I harvest St. John's Wort?

A: Harvest St. John's Wort when the flowers are in full bloom. Cut the stems and hang them upside down in a dry, well-ventilated area.

Q: Can I eat St. John's Wort?

A: No, St. John's Wort should not be eaten.

Q: Is St. John's Wort safe for pets?

A: St. John's Wort can be toxic to pets, so keep it out of reach.

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