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SUS Farms · Utah Seed Library

Growing Sunflower in Utah

flower · Asteraceae · warm season · 80 days to harvest

Methoddirect
Days to maturity80 days
Seed depth1″
Plant spacing18″
Row spacing30″
Germ. temp70–85°F

Schedule (May 15 last frost · Sevier County)

Direct sow5/22
First harvest8/7

Planting depth, drawn to scale

0"1"2"3"4"5"6"1" deep

Step-by-step

  1. 1. Direct sow 1″ deep, 18″ apart. Soil should be at least 70°F before planting. Black plastic mulch laid two weeks ahead helps in cool springs.
  2. 2. Mulch and water consistently. 2" of straw or wood chip around the base. Drip line at surface. 1" per week including rain.
  3. 3. Harvest around day 80. Mammoth varieties hit 12 ft. ProCut series gives single-stem cut flowers in 60 days.