Zinnia Seeds – Giant Cactus

Zinnia ‘Giant Cactus’ is an eye-catching variety prized for its large, dahlia-like blooms with long, twisted petals that create a unique, spiky appearance. These brilliant flowers bloom continuously through the warm months, adding vibrant color and texture to garden beds, borders, and bouquets. Easy to grow and low-maintenance, the Giant Cactus Zinnia is a perfect choice for gardeners seeking bold summer displays and long-lasting cut flowers.

Features:

• Produces large, semi-double to fully double blooms with curled, cactus-like petals.

• Available in a mix of vivid colors including pink, red, orange, yellow, and white.

• Long blooming period from early summer to frost.

• Excellent for cut flowers due to strong stems and extended vase life.

• Attracts butterflies and pollinators to the garden.

• Thrives in sunny locations and tolerates heat and drought conditions.

• Easy to grow from seed; suitable for both new and experienced gardeners.

Specifications:

• Scientific Name: Zinnia elegans ‘Giant Cactus’

• Common Name (US): Zinnia

• Plant Type: Annual

• Bloom Color: Mixed colors (red, yellow, pink, orange, white)

• Bloom Size: 4–6 inches in diameter

• Plant Height: 30–40 inches (75–100 cm)

• Sunlight Requirement: Full Sun

• Soil Type: Well-drained, fertile soil

• Watering: Moderate; allow soil to dry slightly between watering

• Germination Time: 7–10 days

• Days to Bloom: 60–70 days after sowing

• Sowing Method: Direct sow outdoors after last frost or start indoors 4–6 weeks early

• Spacing: 10–12 inches apart

• Growing Season: Spring through Fall

• USDA Hardiness Zones: 2–11 (grown as annual in all zones)

• Best Planting Months (by Zone):

  • Zones 2–5: May to June

  • Zones 6–9: April to May

  • Zones 10–11: February to March

• Use: Garden beds, borders, containers, and as long-lasting cut flowers