St. John’s-Wort spreads by lateral roots and can produce up to 100,000 seeds per plant.

Is all St John's wort invasive?

It is clear that St. John’s wort is a tenacious plant in any of its forms, even though some species may not be out-and-out invasive.

Does St John's wort plant spread?

Considering that this plant is so invasive, consider growing St. John’s wort in a container, where its spreading roots and abundant seeds can be kept in check. This plant is easily established in areas where soil is moist but well-drained and in full sun to part shade.