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SUS Farms · Utah Seed Library
Growing Cosmos (Sensation) in Utah
flower · Asteraceae · warm season · 90 days to harvest
Methoddirect
Days to maturity90 days
Seed depth0.25″
Plant spacing18″
Row spacing24″
Germ. temp70–85°F
Schedule (May 15 last frost · Sevier County)
| Direct sow | 5/22 |
| First harvest | 8/21 |
Planting depth, drawn to scale
Step-by-step
- 1. Direct sow 0.25″ deep, 18″ apart. Soil should be at least 70°F before planting. Black plastic mulch laid two weeks ahead helps in cool springs.
- 2. Mulch and water consistently. 2" of straw or wood chip around the base. Drip line at surface. 1" per week including rain.
- 3. Harvest around day 90. Tall variety — 4 to 5 ft. Stake or grow against a fence. White, pink, magenta single blooms on airy foliage.
