Cosmos Sulphur Mix Cosmos Sulphureus is an annual wildflower native to Central America. Cosmos Sulphur Mix seeds can be started indoors, but it is better to start the seeds directly outdoors when conditions allow. Also called Klondike Cosmos, this very popular garden annual features attractive, ferny foliage with strong, long flower stems and produces masses of semi-double, yellow, orange, and red flowers. Sulphur Cosmos blooms heavily from summer until first frost, and its rich in nectar flowers attract bees, butterflies, and hummingbirds.
Cosmos Sulphur Mix is one of the best annual flowers for cutting gardens. Cosmos is also widely used for mass planting, container and pot planting, along roadsides and walkways planting. Cosmos Sulphureus seeds germinate fast, and Cosmos Sulphur plant grows rapidly adapting to virtually any soil conditions and tolerating drought, heat, and humidity. Klondike Cosmos is one of the best cut flower for fresh or dried bouquets.
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