Helianthus orygalis is a species of the genus Helianthus within the family Asteraceae, notable for its predictable flowering window. It flowers in the UK from July to October. Identification should rely on the botanical name when sourcing material. Specialist references or nursery labels provide the best guidance on form and size.

Helianthus orygalis flowers from July to October, so check nursery labels and specialist guides for cultivation and size details.

Helianthus is a genus comprising around 50 species of annual and perennial flowering plants in the daisy family Asteraceae commonly known as sunflowers. The species of Helianthus are native to North America.

Helianthus orygalis

Helianthus salicifolius, the willow-leaved sunflower, is a perennial in the Asteraceae native to the USA. It produces a long season of bloom from July to October. Plant in a sunny position and give moist but well-drained soil. It suits open, sunny schemes where sustained late-summer flowering is wanted.

Willow-leaved sunflower (Helianthus salicifolius) is a perennial that flowers from July to October and prefers full sun with moist, well-drained soil.

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

Helianthus salicifolius

Willow-leaved sunflower | Helianthus salicifolius

Helianthus scaberrimus is a sunflower in the daisy family Asteraceae, noted for producing sunflower-type flower heads during mid to late season. It belongs to the genus Helianthus and flowers from July to October. Identification rests on its membership of the Helianthus group and the characteristic composite blooms typical of sunflowers.

Sunflower Helianthus scaberrimus flowers from July to October and belongs to the family Asteraceae.

Helianthus scaberrimus

Sunflower | Helianthus scaberrimus

Helianthus strumosus, the pale-leaf woodland sunflower, is a species of sunflower native to North America east of the Great Plains and is in the family Asteraceae. It is a native perennial sunflower that resembles other members of this family including the Pale Sunflower (H. decapetalus), Woodland Sunflower (H. divaricatus), Hispid Sunflower (H. hirsutus), and Jerusalem Artichoke (H. tuberosus). Pale-leaf sunflowers can be found in a diverse range of habitats including woodland areas, prairies, and meadows, providing that these habitats have access to partial sun. In the garden it prefers full sun and most soil types. In UK gardens it is tender and needs frost-free protection over winter (RHS H2). Suggested uses include city and courtyard gardens, wildlife gardens, cottage and informal garden and patio and container plants. It tolerates soil of any pH, moist but well-drained conditions and south-facing and west-facing aspects. Plant out after last frost in fertile, well-drained soil.

Helianthus strumosus is a perennial member of the Asteraceae family, characterized by its upright growth and broad, simple leaves. This species produces large flower heads that closely resemble daisies, showcasing the genus's signature appearance.

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

Helianthus strumosus

Helianthus strumosus 'Blauange' is a bushy, clump-forming annual or biennial cultivar within the Helianthus genus, known for upright plants with broad leaves and daisy-like flower heads. This deciduous plant thrives in full sun with a south or west-facing aspect and prefers moist but well-drained soils including chalk, loam, and sand, across a range of pH levels. Suitable for sheltered locations, it is hardy to UK zone H2 and is well suited to city gardens, wildlife areas, and informal settings. Propagation is by seed or division, with clumps divided every few years to maintain vigour.

Helianthus strumosus 'Blauange' is a hardy H2 annual biennial ideal for city gardens and patios, flowering in spring with full sun preference.

Helianthus strumosus 'Blauange'

Helianthus pauciflorus, called the stiff sunflower, is a North American plant species in the family Asteraceae. It is widespread across the Great Plains, the Rocky Mountains, and the Great Lakes region, and naturalized in scattered locations in the eastern United States and in much of southern Canada (from Alberta to Nova Scotia). Stiff sunflower is a perennial herb 50–200 cm (1 ft 8 in – 6 ft 7 in) tall, spreading by means of underground rhizomes. Most of the leaves are attached near the bottom of the stem. It is native to NO. In the garden it prefers full sun and most soil types. In UK gardens it is tender and needs frost-free protection over winter (RHS H2). Suggested uses include city and courtyard gardens, wildlife gardens, cottage and informal garden and patio and container plants. It tolerates soil of any pH, moist but well-drained conditions and south-facing and west-facing aspects.

Helianthus subrhomboideus is a member of the Asteraceae family, characterized by its robust, upright growth. This species showcases broad, uncomplicated foliage and produces sizable flower heads reminiscent of daisies, making it an interesting addition to any collection.

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

Helianthus subrhomboideus

Helianthus tomentosus is a perennial sunflower grown for its edible tubers and late-summer flowerheads. Native to central North America, it suits full-sun sites on well-drained sandy or loamy soil with a pH of 6.0–7.5. It prefers moist, well-drained conditions and is fully hardy in the UK (H7). It flowers from July to October.

Jerusalem artichoke offers edible tubers and late-summer flowers and prefers full sun with well-drained sandy or loamy soil.

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

Helianthus tomentosus

Jerusalem artichoke | Helianthus tomentosus

Helianthus tuberosus 'Sakhalinski' is a bushy, clump-forming cultivar of the Helianthus genus, known for its upright, often tall annual or biennial plants with broad, simple leaves. This deciduous plant thrives in full sun on south-facing, sheltered sites with moist but well-drained loam soil of neutral to alkaline pH. Hardy to UK zone H5, it is suitable for wildlife gardens, cottage and informal gardens, flower borders, and cut flowers. It is best cultivated in well-drained soil and propagated by seed or division, with interest in the spring season.

Helianthus tuberosus 'Sakhalinski' is a hardy H5 annual biennial ideal for full sun, spring interest, wildlife gardens, and cut flowers.

Helianthus tuberosus 'Sakhalinski'

Helianthus x doronicoides is a bushy, clump-forming annual or biennial cultivar within the Helianthus genus, known for upright plants with broad leaves and daisy-like flower heads. This deciduous plant thrives in full sun and prefers sheltered, south- or west-facing aspects. It grows well in moist but well-drained soils including chalk, loam, and sand, across a range of pH levels from acid to alkaline. Hardy to UK zone H2, it is suitable for city and courtyard gardens, wildlife areas, cottage and informal gardens, as well as patios and containers. Propagation is by seed or division, with established clumps divided every 2 to 4 years to maintain vigour.

Helianthus x doronicoides is a bushy annual or biennial with daisy-like flowers, thriving in full sun and ideal for city gardens and patios in spring.

Helianthus x doronicoides

Helianthus x laetiflorus 'Daniel Dewar' is a bushy, clump-forming annual or biennial cultivar within the Helianthus genus, known for its upright growth and daisy-like flower heads. It has deciduous foliage and thrives best in full sun with a south- or west-facing aspect, ideally in sheltered locations. This cultivar prefers moist but well-drained soils, including chalk, loam, and sand, across a range of pH levels from acid to alkaline. Suitable for city and courtyard gardens, wildlife areas, and informal settings, it is hardy to UK zone H2 and is typically of interest during the spring season.

Helianthus x laetiflorus 'Daniel Dewar' is a bushy annual or biennial with daisy-like flowers, thriving in full sun and ideal for city and wildlife gardens in

Helianthus x laetiflorus 'Daniel Dewar'

Helianthus x laetiflorus 'Grandiflora' is a bushy, clump-forming annual or biennial cultivar within the Helianthus genus, known for upright plants with broad, simple leaves and large daisy-like flower heads. This deciduous plant thrives in full sun with a south- or west-facing aspect and prefers moist but well-drained soils including chalk, loam, or sand with a range of pH levels. Hardy to UK zone H2, it suits sheltered locations and is ideal for city gardens, wildlife areas, and informal planting schemes. Propagation is by seed or division, with established clumps divided every 2-4 years to maintain vigour.

Helianthus x laetiflorus 'Grandiflora' is a bushy annual or biennial with large daisy-like flowers, ideal for full sun in city and wildlife gardens.