Botanical Interests Rubenza Cosmos Seeds

Deeply colored 3" blooms are beauteous in contrast when paired with white flowers and silver-foliage plants. A Fleuroselect Novelty award winner, this cosmos is a real standout in the garden or a vase, and butterflies love them, too. Blooms start out red-wine colored and turn to dusky rose as they age. Growing cosmos is an easy way to add color to your garden, as they require little attention and are drought tolerant.

Variety Info

Family: Asteraceae

Type: Cosmos (Learn more)

Native: Mexico and Arizona

Hardiness: Annual

Exposure: Full sun

Bloom Period: Summer to frost

Plant Dimensions: 24"–32" tall, about 28" wide

Variety Info: Flowers up to 3" start out deep wine-red, turning to rose as they age.

Attributes: Attracts Butterflies, Attracts Hummingbirds, Attracts Pollinators, Cut Flower, Drought Tolerant

Sowing Info

When to Sow Outside: RECOMMENDED. 1 to 2 weeks after your average last frost date, and when soil temperature is at least 60°F.

When to Start Inside: 4 to 6 weeks before your average last frost date.

Days to Emerge: 5–10 Days

Seed Depth: Barely cover

Seed Spacing: A group of 3 seeds every 12"

Thinning: When 1"–2" tall, thin to 1 every 12"