The sunflower grows to a height of 5 to 7 feet and needs moderate to warm temperatures to mature properly. The time required for a sunflower to grow from seed depends on the weather and temperature conditions in which it is grown.
Sunflowers mature in approximately 100 days. This is a short time to maturity compared to many other crops.
Sunflowers grown in colder regions may take 90 to 100 days to reach maturity. Those in more mild climates take 100 days or more to mature.
Sunflower seeds sprout about 11 days after planting. The sunflower continues to grow and develop for about 75 days. It reaches maturity approximately 30 days after the end of pollination.