What zone does St John’s wort grow in?

Zone: USDA plant hardiness zones 5 through 10. Soil: St John’s Wort grows well in sand, clay, rocky soil or loam, and tolerates acidic to slightly alkaline pH.

Does St John’s wort like sun or shade?

Grow St. John’s wort in moist but well-drained soil in full sun to partial shade. Shrubby hypericums, such as Hypericum ‘Hidcote’ can become untidy and should be pruned in spring.

Is St John’s Wort easy to grow?

St. John’s Wort is very easy to grow. We started Hypericum perforatum from seed indoors this winter. The seeds germinated easily and the seedlings grew very well.

Is St John’s wort an annual or perennial?

perennial herb

St John’s wort is a perennial herb, native to Europe, western Asia and North Africa. It is grown for use as an anti-inflammatory, astringent and antiseptic. St John’s wort is an invasive weed in more than 20 countries and has the potential to spread across cooler, upland areas of southern Queensland.

Does St John’s wort spread?

Common St. Johnswort spreads both by underground rhizomes, above-ground creeping stems, and by seeds that are dispersed by wind and animals. One plant can produce up to 15,000 to 34,000 seeds per year that are viable for up to 30+ years.

Should St John’s wort be cut back in the fall?

Cutting Back St.



John’s Wort does not need cutting back in the fall. Leaving the berry stems will provide food for garden wildlife and also help to insulate the growing crown. Any pruning should be done in the early spring as new growth is emerging. Any branches with winter damage can be cut back to the main stem.

Should you cut back St John’s wort?

Prune plants as needed in early spring and they will produce a large crop of flowers in summer. Every three or four years, consider renewal pruning St. John’s wort. Renewal pruning involves shearing the plant back to half its height in spring.

Is St John’s wort toxic to dogs?

While St. John’s wort is helpful for certain health issues in people, any amount can be toxic to your dog. Also known as klamath weed, St. John’s wort contains hypericin, which is toxic in dogs and its ingestion can lead to photosensitization and various other health issues.

When should you avoid St John’s wort?

It can also interfere with anti-rejection medications, heart medications, and some drugs used for heart disease, HIV, and cancer. One 2011 study indicated the herbal supplement can reduce the effectiveness of Xanax, an anxiety medication. Wolf noted that pregnant or breastfeeding women should avoid St. John’s wort.

Why is St John’s wort not prescribed?



St John’s wort has significant interactions with a large number of medicines which are in common use. This means that it may affect the way the body processes other medications, which may make them less effective, or increase the chances of harmful side effects.

Can St Johns Wort take full sun?

Growing St. John’s wort herb in a location with too much sun can lead to leaf scorch, while too much shade reduces the number of flowers. The best location is one with bright morning sunlight and a little shade in the hottest part of the afternoon.

Does St John’s wort need a lot of water?

St. John’s Wort needs minimal supplemental watering after it has fully established, but it does require consistently moist soil after first planting. Lack of watering is indicated by drooping foliage and flowers that either fail to open or fall off the plant before opening.

What can I plant next to St John’s wort?

Companion Plants:



As it’s a heavy bloomer in midsummer, pair St. John’s Wort with complementary flowers to keep year round interest. In tough sites, use companions like Wood’s Purple Aster, Hairy Wild Petunia, Montrose White Calamint, or Pixie Meadowbrite™ Coneflower.

How often should I water St John’s wort?



John’s wort can withstand drought but is intolerant of waterlogged soil. In the first year after planting, about 2.5 cm of water every week will be enough. In areas with plentiful rain, no additional watering is needed.

Is St John’s wort toxic to dogs?

While St. John’s wort is helpful for certain health issues in people, any amount can be toxic to your dog. Also known as klamath weed, St. John’s wort contains hypericin, which is toxic in dogs and its ingestion can lead to photosensitization and various other health issues.

When should you avoid St John’s wort?

It can also interfere with anti-rejection medications, heart medications, and some drugs used for heart disease, HIV, and cancer. One 2011 study indicated the herbal supplement can reduce the effectiveness of Xanax, an anxiety medication. Wolf noted that pregnant or breastfeeding women should avoid St. John’s wort.