About

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.

About the genus

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. The best-known species is the common sunflower.

Wikipedia contributors, "Helianthus", CC BY-SA 4.0 — Helianthus

In the garden

Helianthus orygalis belongs to the genus Helianthus and is placed in the family Asteraceae; the name is the primary identifier to use when ordering or researching the plant. Flowering occurs from July to October, so expect blooms through mid- to late summer into autumn. Beyond the flowering period, confirm variety-specific details from the supplier, as growth habit and size can differ between species and cultivars within Helianthus. When preparing to grow material bought as Helianthus orygalis, check the plant label or the nursery’s product notes for recommended siting, soil preferences and frost tolerance; those particulars vary and will determine how you use it in the garden. Allow room for mature spread, and consider staking or grouping with similarly timed perennials if the plant produces tall flowering stems. Deadhead spent flowers only if you want to restrict seeding; otherwise leave some heads to assess seed production for the following season. In the UK landscape, use Helianthus orygalis where a reliable July–October display is required and match the plant’s stated dimensions and hardiness on the label to your border or bed. Always check that the plant you receive is labelled Helianthus orygalis so its listed July to October flowering aligns with your planting plans.

From the Fenn Plants journal

• Notes on DaffodilsWhen to plant daffodil bulbs in the UK, how deep, how to naturalise them in grass, why daffodils stop flowering (“blindness”), and why you should never mix cut daffodils with other flowers.
• Keeping Your NerveHow to garden through a heatwave — the best time to water, why deep soaks beat daily sprinkles, caring for pots and vulnerable plants, and why you can let the lawn go brown.
• Made to LastHow to clean, store and protect garden pots and planters — the frost-proof vs frost-resistant difference, winter care for terracotta and ceramic, and how to reuse a broken pot.

More in the Helianthus genus

• 
  Helianthus atrorubensdark red sunflower
• 
  Helianthus decapetalusthin-leaf sunflower
• 
  Helianthus salicifoliuswillow-leaved sunflower
• 
  Helianthus tomentosusJerusalem artichoke
• Helianthus 'Carine'Sunflower
• Helianthus annuus Solano Orange Nr. 14 (Solano Series)Common Sunflower
• Helianthus scaberrimusSunflower