Cosmos Sulphur Yellow Cosmos Sulphureus is a half-hardy, tall, branching annual native to Central America. Cosmos Sulphur Yellow seeds are usually planted directly outdoors, and also known as Klondike Cosmos this tall, bushy variety forms clumps of robust, lacy-leaved foliage and blooms with vibrant, lemon-yellow, semi-double flowers. Sulphur Cosmos blooms continuously from summer until first frost, and the showy, yellow flowers attracts butterflies and bees.
Cosmos Sulphur Yellow is widely popular annual for cutting gardens, borders, container planting, and mass planting in naturalized landscaping. Easily started from Cosmos Sulphureus seeds, this Yellow Cosmos plant resists drought and heat and likes to grow in full sun. The average, dry or moist, but well-drained soil is preferable. Sulphur Cosmos re-seeds generously and makes a superb cut flower.
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