St. John's Wort - Hypericum anagalloides

St. John's Wort - Hypericum anagalloides

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Generalities Hypericum anagalloides

The water hypericum is a perennial aquatic plant, widespread in the swamps of North America; it has slightly fleshy stems, brownish-green in color, with a prostrate or creeping posture, which branch off from vigorous stoloniferous roots.

Where the stems touch the ground, they tend to root easily, and this aspect facilitates a rapid spread of the hypericum plants that colonize the soil by progressively spreading in patches.

The leaves are attached directly to the stem, without petiole, bright dark green, thick and waxy, turning purple red in autumn .; from May to September it produces numerous small star-shaped flowers, of a very intense golden yellow color, followed by small semi-woody capsules containing numerous dark seeds. These plants tend to colonize the soil quickly and in some cases can become weeds over time. Almost all varieties of St. John's wort are toxic to animals, if consumed in large quantities, and are used in herbal medicine.


Place the Hypericum anagalloides plants in full sun, as they are species that love the sun, or in partial shade; plants grown in full shade grow very well but tend to produce few flowers. This species of St. John's wort develops best in the vicinity of quiet streams or small shallow bodies of water, as it requires constant soil moisture; sometimes the stems and leaves can float on the surface of the water, it is therefore possible to plant this plant even in an aquatic garden, or on the banks of a pond. It does not fear the cold, even if the aerial part often dries up in the coldest months of the year.

St. John's wort can also be grown in pots as long as a deep substrate is chosen and the soil is kept constantly humid to recreate the optimal conditions for this species.

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As regards the cultivation surface, Hypericum anagalloides grows in any soil, but prefers calcareous soils; it is possible to grow these plants also in containers, but it is necessary to provide them with a very large pot, and to water them regularly, even twice a day. It is an overall very rustic plant that adapts to many situations but that in those listed manages to give the best of itself.


The multiplication of Hypericum anagalloides generally occurs by division: at the beginning of spring or in autumn the lateral shoots already rooted are taken and immediately planted individually. It is also possible to propagate these plants by seed, but remember to keep the small seeds in water for at least 8-12 hours before sowing. This method is undoubtedly the safest and fastest for this species.

St. John's Wort - Hypericum anagalloides: Parasites and diseases

Speaking of diseases and parasites, these plants are very vigorous and rustic and generally are not attacked by parasites or diseases. Hypericum anagalloides resists winter well and in cold areas tends to lose the aerial part due to desiccation and then resume its vegetative activity at the beginning of the summer.

Video: St john wort update 2020