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Tufted Loosestrife

Lysimachia thyrsiflora

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Plant Profile

Flowering Months:
Lythraceae (Purple Loosestrife)
Life Cycle:
Maximum Size:
90 centimetres tall
Ditches, fens, gardens, marshes, riverbanks, riversides, waterside, wetland.

Yellow, 5 petals
Yellow feathery bell-shaped flowers with black dotted petals. 5 stamens.
A dark, long but globular, 5-parted, dotted fruit capsule.
Narrow, lance-shaped leaves, in opposite pairs up an erect stem. Black dotted and unstalked. Perennial.
Other Names:
Tufted Yellow Loosestrife.
Frequency (UK):

Similar Species

Other Information


Lysimachia thyrsiflora, also known as Tufted Loosestrife or Tufted Yellow Loosestrife, is a species of perennial herb that is native to North America. It is known for its small, yellow, star-shaped flowers that bloom in the summer and its basal leaves. The plant can grow up to 2-3 feet in height and forms dense tufts. It prefers moist, well-drained soils and full sun to partial shade, and it is often found in wetland habitats and along stream banks. Lysimachia thyrsiflora is often grown as an ornamental plant in gardens and is also used in naturalized settings and wetland restoration projects. It is a hardy plant and is well suited to growing in moist, shady areas, it is also known to be a good plant for stabilization of stream banks and other wetland areas.


Tufted Loosestrife, scientifically known as Lysimachia thyrsiflora, is a beautiful and unique flowering plant that belongs to the Primulaceae family. It is native to North America and is commonly found growing in wetlands, marshes, and along riverbanks.

Tufted Loosestrife is a perennial plant that can grow up to 3 feet tall and 2 feet wide. It has a clump-forming habit and produces upright stems that are covered in narrow leaves that are arranged in whorls around the stem. The leaves are dark green, glossy, and up to 6 inches long.

One of the most distinctive features of Tufted Loosestrife is its flowers. The plant produces clusters of small, bell-shaped, yellow flowers that are held in a tight spike at the top of the stem. The flowers bloom from mid-summer to early fall and are a great source of nectar for bees, butterflies, and other pollinators.

Tufted Loosestrife is a hardy plant that is easy to grow and care for. It prefers full sun to partial shade and moist, well-drained soil. It is a great choice for wetland restoration projects, rain gardens, and naturalized areas. It can also be grown in containers and used as a striking accent plant in mixed borders.

One important thing to note is that Tufted Loosestrife can be invasive in some areas. It has a tendency to spread quickly and can outcompete native plants if not kept in check. It is important to research local regulations and best management practices before planting Tufted Loosestrife.

In traditional medicine, Tufted Loosestrife has been used to treat a variety of ailments, including stomach problems, skin irritations, and snakebites. However, it is important to note that the plant can be toxic if ingested and should not be used without proper guidance from a trained healthcare professional.

Tufted Loosestrife has a rich cultural history and has been used for various purposes by Indigenous communities for centuries. The Cherokee people used the plant as a traditional medicine to treat respiratory and digestive problems, while the Iroquois used it as a poultice to treat skin irritations and wounds.

In addition to its medicinal properties, Tufted Loosestrife has also been used for dyeing. The plant contains a yellow pigment that can be extracted and used to dye textiles and other materials. In fact, the plant's Latin name, Lysimachia, is derived from the Greek word "lysima," which means "to dissolve," referring to the plant's use as a dye.

Tufted Loosestrife is also a popular ornamental plant in gardens and landscapes. Its bright yellow flowers add a pop of color to any garden, and its upright habit makes it a great choice for creating vertical interest in mixed borders. It can also be used as a cut flower in floral arrangements.

When it comes to care and maintenance, Tufted Loosestrife is a relatively low-maintenance plant. It does not require regular pruning or deadheading, but it is important to keep the soil consistently moist. In addition, the plant may benefit from a light application of fertilizer in the spring.

Tufted Loosestrife is a versatile and attractive plant that can be used for a variety of purposes. Whether you are looking for a natural medicine, a dye source, or an ornamental plant for your garden, Tufted Loosestrife is a great choice. Just be sure to research local regulations and best management practices before planting to ensure that it is not invasive in your area.

In the wild, Tufted Loosestrife plays an important role in wetland ecosystems. It provides habitat and food for a variety of wildlife, including bees, butterflies, and other pollinators. Its leaves are also an important food source for some caterpillars.

Tufted Loosestrife can also help to prevent erosion and improve water quality in wetland areas. Its deep roots help to stabilize soil and prevent sediment from washing into nearby waterways. In addition, the plant absorbs excess nutrients from the water, which can help to reduce harmful algal blooms and other water quality issues.

As mentioned earlier, Tufted Loosestrife can be invasive in some areas. This is because it has a high reproductive capacity and can spread quickly through seed dispersal and vegetative reproduction. If left unchecked, Tufted Loosestrife can form dense stands that outcompete native plants and alter the structure and function of wetland ecosystems.

To prevent the spread of Tufted Loosestrife, it is important to properly dispose of plant material and not to transport it to new areas. In addition, it is important to use caution when planting Tufted Loosestrife in wetland restoration projects or other naturalized areas. Local regulations and best management practices should be followed to ensure that the plant is not invasive in the area.

Overall, Tufted Loosestrife is a fascinating and useful plant that has many benefits and uses. However, it is important to be aware of its invasive tendencies and to take appropriate measures to prevent its spread. With proper care and management, Tufted Loosestrife can be a valuable addition to wetland restoration projects, rain gardens, and other naturalized areas.

Distribution Map

Reproduced by kind permission of the BSBI.

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