Lythrum alatum, commonly known as winged loosestrife or milkweed, is a clump-forming herbaceous perennial in the Lythrum genus. This deciduous plant thrives in full sun and can be grown in a variety of soil types, including chalk, clay, loam, and sand, with moisture levels ranging from moist but well-drained to poorly-drained. It is hardy in the UK (H7) and suitable for east, south, or west-facing aspects in both exposed and sheltered locations. Lythrum alatum is ideal for cottage and informal gardens, wildlife gardens, and wildflower meadows, offering interest through summer and autumn. Propagation is by division or basal cuttings in spring.

Lythrum alatum, winged loosestrife, is a hardy herbaceous perennial for full sun, ideal for wildlife gardens and wildflower meadows in summer and autumn.

Lythrum alatum

It is native to Europe but it is known elsewhere, including parts of Australia and eastern and western North America, as an introduced species and sometimes a weed. It is rare in the United Kingdom, with occasional isolated populations. It often grows in moist habitats, such as marshes and wet agricultural fields, rice paddies, for example. It is a mostly upright, branching annual or biennial herb growing 10 to 60 centimeters (3.9 to 23.6 in) tall. Grow it in full sun and most soil types. In UK gardens it is fully hardy throughout the UK (RHS H7). It works well for cottage and informal garden, wildlife gardens and wildflower meadow. It tolerates soil of any pH, moist but well-drained, poorly-drained conditions and east-facing, south-facing and west-facing aspects. Plant out after last frost in fertile, well-drained soil.

Lythrum hyssopifolia, commonly known as grass poly or hyssop-leaved loosestrife, belongs to the Lythraceae family. This species showcases simple leaves arranged in pairs and is characterized by its small, star-like flowers that cluster in leafy racemes.

https://en.wikipedia.org/wiki/Lythrum_hyssopifolia

Lythrum hyssopifolia

Lythrum portula is a species of flowering plant in the loosestrife family known by the common names water-purslane and spatulaleaf loosestrife. It is native to Europe, and it is found in parts of western North America as an introduced species. It often grows in moist habitat, such as marshes. This is a prostrate annual herb producing a hairless, reddish stem up to 25 centimeters long, which lies along the ground and roots where its nodes come in contact with wet earth. In the garden it prefers full sun and most soil types. In UK gardens it is fully hardy throughout the UK (RHS H7). Suggested uses include cottage and informal garden, wildlife gardens and wildflower meadow. It tolerates soil of any pH, moist but well-drained, poorly-drained conditions and east-facing, south-facing and west-facing aspects.

Lythrum portula, or water purslane, is a hardy herbaceous perennial for full sun, ideal for wildlife gardens and wildflower meadows in summer and autumn.

https://en.wikipedia.org/wiki/Lythrum_portula

Lythrum portula

Lythrum salicaria 'Florarose' is a clump-forming herbaceous perennial cultivar of the Lythrum genus, known for its simple, opposite leaves and star-like flowers arranged in leafy racemes. This deciduous plant thrives in full sun on a south-facing, sheltered aspect and prefers moist, poorly-drained loam or clay soils with a range of pH levels from acid to alkaline. Hardy to UK zone H7, it is suitable for cottage and informal gardens, wildlife gardens, wildflower meadows, and flower borders. It is best planted after the last frost in fertile soil and can be propagated by division in spring, with interest in both spring and summer.

Lythrum salicaria 'Florarose' is a hardy H7 herbaceous perennial with star-like flowers, ideal for sunny borders, wildflower meadows, and wildlife gardens.

Lythrum salicaria 'Florarose'

Lythrum salicaria 'Swirl' is an herbaceous perennial in the Lythraceae grown for its upright spikes of purple flowers. It forms clumps of deciduous foliage and flowers from July to September. Suited to full sun and moist soils, it tolerates both well-drained and poorly drained conditions. The cultivar performs well in south- or west-facing positions in exposed or sheltered sites.

Purple Loosestrife (Lythrum salicaria 'Swirl') produces purple flower spikes from July to September and suits moist, south- or west-facing borders.

Lythrum salicaria 'Swirl'

Lythrum salicaria 'Swirl' | Summer spikes

Lythrum virgatum, commonly known as wand loosestrife, is a clump-forming herbaceous perennial belonging to the Lythraceae family. This deciduous plant thrives in full sun and can be grown in a variety of soil types, including clay and loam, with poor drainage. It is suitable for both exposed and sheltered positions, favouring south or east-facing aspects. Lythrum species typically have simple, opposite leaves and star-like flowers arranged in leafy racemes, making this cultivar a charming addition to cottage gardens, wildflower meadows, and flower borders during spring and summer.

Lythrum virgatum, wand loosestrife, is a hardy herbaceous perennial for full sun, ideal for wildlife gardens and flower borders in spring and summer.

Lythrum virgatum

Lythrum virgatum 'Dropmore Purple' is a clump-forming perennial in the Lythraceae with deciduous foliage that flowers in mid to late summer. It favours a sunny position and tolerates a range of soils from clay to loam, including damp or poorly drained ground. Fully hardy in UK gardens (H7), it reliably produces season-long blooms from July to September. Plant it where its upright summer inflorescences can be seen from paths or borders.

Lythrum virgatum 'Dropmore Purple' is a clump-forming loosestrife for full sun, flowering July–September and suited to clay or loam and damp soils.