Epilobium angustifolium is a perennial herbaceous plant that produces erect stems to around 2.0 m and flowers from June to September. It is native across the temperate Northern Hemisphere and favours open, sunny sites. Plants grow on sandy, loamy or clay soils that are well drained or moist yet free-draining. Fully hardy to H7, it suits exposed UK conditions when given full sun.

Fireweed (Epilobium angustifolium) reaches about 2.0 m and flowers June to September; plant in full sun on well-drained soil.

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

Chamaenerion is a genus of flowering plants in the family Onagraceae. It has sometimes been included in the genus Epilobium.

Epilobium angustifolium

Fireweed | Epilobium angustifolium

Epilobium angustifolium 'Album' is a perennial herbaceous willowherb prized for its tall summer-white flower spikes. It grows on erect stems to about 2.0 m. Plant in a sunny spot on sandy, loamy or clay soils that are well-drained or moist but free-draining. Fully hardy (H7) and native to the temperate Northern Hemisphere.

White Fireweed (Epilobium angustifolium 'Album') forms tall summer-white flower spikes to about 2.0 m and prefers full sun with well-drained soil.

Epilobium angustifolium 'Album'

White Fireweed | Epilobium angustifolium 'Album'

Epilobium angustifolium 'Isobel' is a tall herbaceous perennial reaching about 2.0 m, notable for upright stems bearing racemes of magenta-pink flowers. It flowers from June to September. Plant in full sun in a well-drained soil; it tolerates sandy, loamy or clay soils if drainage is adequate. It carries the hardiness rating H7, meaning it is fully hardy across the UK.

Fireweed Epilobium angustifolium 'Isobel' bears magenta-pink flowers from June to September and reaches about 2.0 m; plant in full sun on well-drained.

Epilobium angustifolium 'Isobel'

Fireweed | Epilobium angustifolium 'Isobel'

Epilobium dodonaei is a perennial herbaceous willowherb in the Onagraceae, adapted to sandy and rocky ground in mountainous parts of Europe. It prefers full sun or partial shade and tolerates dry to medium soil moisture. Flowers appear in summer, from June to September. Plants establish best in well-drained, gritty substrates where water does not linger.

Dodonaeus' willowherb (Epilobium dodonaei) blooms June to September and suits well-drained, sandy or rocky soils in sun or partial shade.

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

Epilobium dodonaei

Dodonaeus' willowherb | Epilobium dodonaei

Epilobium fleischeri is a herbaceous perennial from Alpine regions, notable for bright pink, fragrant flowers with darker sepals. It typically grows in small clusters on stony, well-drained ground and produces blooms from June to September. Leaves are usually hairless and toothed, and the plant belongs to the Onagraceae family.

Alpine willowherb Epilobium fleischeri is an Alpine herbaceous perennial with bright pink, fragrant flowers that bloom June to September.

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

Epilobium fleischeri

Alpine willowherb | Epilobium fleischeri

Epilobium latifolium is a perennial herb in the Onagraceae that forms compact clumps and produces nodding flowers. It is native to circumboreal regions of the Northern Hemisphere and remains close to the ground at around 0.4 m tall. The plant suits sunny, moist but well-drained sites and tolerates sandy, loamy or clay soils. It flowers from June to September.

Dwarf fireweed (Epilobium latifolium) is a circumboreal perennial herb that flowers June to September with pink or white nodding blooms.

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

Epilobium latifolium

Dwarf fireweed | Epilobium latifolium

Epilobium luteum, known as yellow-flowered Californian willowherb, is a clump-forming herbaceous perennial in the Onagraceae family. Like other Epilobium species, it has upright stems with slender, semi-evergreen leaves and produces prominent yellow flowers with four petals arranged in terminal racemes during spring and summer. This plant thrives in full sun or partial shade, tolerating a range of soil types and pH levels, and can grow in both exposed and sheltered locations. It is hardy to UK zone H7 and is suitable for wildflower meadows and wildlife gardens, spreading readily by windborne seed.

Epilobium luteum, yellow-flowered Californian willowherb, is a hardy H7 perennial with semi-evergreen leaves, ideal for wildflower meadows and wildlife gardens