The Pure Crimson -- Where It Works Best

In the garden, Sunflower Red Sun works most powerfully in bold, warm-palette combinations where its vivid crimson reads as the most energetic note in a composition already containing strong warm colours. Classic companions in a full-sun border: Rudbeckia Autumn Forest (for the warm mahogany tones that bracket the crimson); Sunflower Chocolate (for the dark velvet contrast against the vivid red); tall orange Calendula or Marigold (for the orange complement to the red); deep purple Salvia (for the cool complementary contrast). Red Sun also works beautifully in a simple massed planting where a single row or drift of the same vivid crimson creates a bold single-colour statement.

As a Cut Flower

Red Sun is an outstanding cut flower for mixed warm-palette summer arrangements: the long stems (60–90cm on well-grown branching plants) provide the height that most summer flowers lack; the vivid crimson provides the bold warm focal point around which other flowers are arranged; and the near-black disc provides the dark centre that gives the flower visual weight and depth. Cut when the outer petals are fully unfurled but the disc is still firm, re-cut at an angle under water, and condition overnight in deep water. Vase life 10–14 days. In a mixed arrangement with Sunflower Chocolate, the contrast between Chocolate's moody dark velvet and Red Sun's vivid crimson is one of the finest two-variety sunflower combinations available.

Red + Chocolate -- The Signature Pairing

Within the Bishy sunflower range, the natural companion to Red Sun is Sunflower Chocolate: the vivid crimson of Red Sun against the near-black velvet of Chocolate provides the warm-colour contrast that makes both varieties more interesting than they would be alone. In the garden, interplanting Red Sun and Chocolate at 45–60cm spacing creates a border section that is simultaneously warm, vivid and sophisticated -- the two darker sunflower varieties together preventing the planting from feeling either too bright or too sombre. In a vase, two varieties provides the warm-dark-vivid combination that no single-variety sunflower arrangement achieves.

Pollinators and Seed Heads

Red Sun is fully pollen-producing (unlike some hybrid sunflower varieties), making it an important pollinator resource: bumblebees, honeybees and solitary bees visit the open flowers consistently through summer. At the end of the season, the ripening seed heads attract finches -- particularly goldfinches -- who feed on the developing seeds through autumn. Allow some heads to dry fully on the plant; cut when the back of the head is papery and brown and seeds loosen easily. Leave on a bird table or hang as a natural feeder for finches through the autumn and early winter.

Succession Sowing for Extended Season

Red Sun flowers for approximately 6–8 weeks per plant from first to last flower on its branching stems. For an extended cutting season, sow in two batches: April (indoors) for July–August flowers, and mid-May (directly outside or in small pots) for August–September flowers. Three to four weeks between sowings separates the two batches sufficiently that the successive plants come into peak production sequentially, extending the availability of fresh crimson sunflower stems from July well into September.

Size and Staking

Sunflower Red Sun typically reaches 150–180cm in good conditions. At this height, the strong central stem provides significant self-support and staking is often unnecessary in sheltered positions. In exposed gardens subject to summer wind and storms, a single bamboo cane per plant inserted to 60cm depth and tied loosely at 90–120cm provides sufficient support without constraining the natural branching habit. Insert canes at planting time, before the plants reach the height where they might be damaged by the insertion of a cane through developed root systems.