Yes, creeping St John’s wort (Hypericum calycinum) is considered an invasive plant species in many areas. It is considered a noxious weed in some areas, particularly in the southeastern United States. Creeping St John’s wort is a fast-spreading, evergreen groundcover that can quickly outcompete native plants. It spreads primarily by seed, which can be dispersed by animals, wind, and water. Controlling it requires removing the plant from the area, as well as preventing seed dispersal.

Does St John’s wort spread?

St John’s wort (Hypericum perforatum) is an herbaceous perennial plant that grows in many parts of the world. It spreads by seed and rhizomes, or underground stems that can extend several feet, sending out lateral shoots and forming new plants. St John’s wort is considered an invasive species in many areas, and can spread quickly if not managed properly. To prevent the spread of St John’s wort, it is important to remove the flowers and seed heads before they mature and to control the spread of the rhizomes.

What are some of the disadvantages of St John’s wort?

Some of the potential disadvantages of St John’s wort include potential interactions with other medications, potential side effects, and reduced effectiveness over time. Interactions with certain medications can cause serious health risks, so it is important to discuss any potential interactions with your doctor before taking St John’s wort. Side effects can include dizziness, dry mouth, and headaches, and the effectiveness of St John’s wort can decrease over time, so it is important to adjust the dosage as needed.