Cosmos bipinnatus Kiiro | Pastel Yellow Japanese Cosmos Seeds

Cosmos bipinnatus ‘Kiiro’ | Pastel Yellow Japanese Cosmos Seeds

Cosmos bipinnatus ‘Kiiro’ is a subtle yet striking cosmos variety originating from Japan, cherished for its uniquely soft, pastel color palette. The elegant daisy-like petals appear in the lightest shades of pastel yellow, gently blending into cream, peach, and occasional blush-pink tones, creating a calm, airy presence in both the garden and floral arrangements.

Tall, graceful plants form soft clouds of soothing color and are ideal for the back of borders, meadow-style plantings, and cut flower production. A truly distinctive cosmos, Kiiro is loved by gardeners, florists, and pollinators alike.

Every garden should include Cosmos bipinnatus – one of the easiest annuals to grow, generously flowering from early summer until frost.

Plant Information

• Common name: Cosmos Kiiro
• Botanical name: Cosmos bipinnatus
  
• Life cycle: Annual
• Flower color: Pastel yellow with peachy/pink reverse tones
• Plant height: 90–120 cm (up to 4 ft)
• Location: Full sun
• Flowering period: June – October
• Days to maturity: 60–90 days
• Seed to bloom: 8–12 weeks

Sowing & Germination

• Germinator type: Light germinator
• Pre-sowing indoors: March – April
• Sow outdoors: May – June (after last frost)
• Seed depth: 1/8–1/4" (lightly cover)
• Germination time: 7–14 days (up to 21 days)
• Ideal temperature: 21°C (70–75°F)
• Frost hardy: No

Indoor sowing:
Sow into moist, well-drained seed compost. Lightly cover seeds. Keep at ~21°C. Germination occurs within 1–2 weeks. Transplant seedlings when large enough to handle and grow on under cover. Harden off before planting outdoors after frost risk has passed.

Direct sowing:
Sow directly into moist, well-drained soil once frost danger has passed. Keep soil evenly moist until established.

Growing & Cultivation Tips

• Water regularly, but do not overwater
• Pinch out plants when they reach ~30 cm to encourage branching and more flowers
• Wider spacing helps produce stronger, thicker stems
• Plant spacing: 20–30 cm apart

Why Choose Cosmos ‘Kiiro’?

• Rare Japanese pastel yellow cosmos
• Unique blend of yellow, cream, peach & soft pink tones
• Long, elegant, cuttable stems
• Excellent for borders, flower farms & natural bouquets
• Extremely easy to grow and highly productive
• Pollinator-friendly