Cosmos Sulphur Red Cosmos Sulphureus is a herbaceous, flowering annual plant native to Central America. Cosmos Sulphur Red seeds can be started indoors in February to early March for transplanting after last frost. Also called Klondike Cosmos, this plant has airy, feathery foliage and blooms with masses of very showy, semi-double red cosmos flowers. Cosmos is a vigorous bloomer, and the plant blooms over a long period, from early summer until first frost attracting beneficial pollinators including butterflies and bees.
Cosmos Sulphur Red is a popular addition to cutting gardens, and one of the best annual flowers for annual borders, container and mass planting. Cosmos Sulphureus seeds can be planted directly outdoors from early March until mid-June, and Cosmos is drought and heat tolerant plant that grows best in full sun and average, dry or moist, but well-drained soil. Cosmos Sulphur is an exceptional cut flower and suitable for xeriscaping.
Height: 24-36 Inches
Bloom Season: Summer/Fall
Environment: Sun/Partial Shade
Soil Type: Average/Poor/Dry/Medium well-drained, pH 6.1-7.4
USDA Zones: All Regions of North America
Sow Indoors: Spring (2-4 weeks before last frost)
Sow Outdoors: Spring/Summer (Zones 1-6) Fall (Zones 7-11)
Seed Depth: 1/16 Inch
Germination Time: 14-21 Days