Basics

Ease of Growing
Easy
Grown as
Annual
Days to Maturity
0 (Spring/Summer), 90-100 (Fall/Winter)
Growing Habit
-
Hardiness
Half Hardy

Sunflowers will tolerate light frost.

Crops
Spring Transplant, Spring, Summer
Growing Season
Long
Cultivar Type
-
Growing Conditions
Warm, Hot

Sunflowers needs rich soil for good growth. They prefer full sun (though they will tolerate light shade). The taller varieties need shelter from the wind and should be placed where they won't cast unwanted shade on other plants.

Outdoor Growing Temp
55°F - 95°F
Min Outdoor Soil Temp
50°F

Don't plant out until the soil is at least 50˚ F (and preferably 60˚ F).

Start Indoors
Yes
Start Outdoors
Yes
Light
Water
Moderate

Sunflowers are thirsty plants and for maximum production they need a constant supply of water.

Feeder
Heavy

Low nitrogen. High phosphorus. High potassium. Sunflowers like phosphorus and potassium, but not too much nitrogen as it may encourage leaf growth rather than flowering.

Suitability
High heat, Needs lots of space
Small Gardens?
No
Containers?
No
-
Attracts beneficial insects?
Yes
Color
Golden
Fruit Size
10.0 - 18.0"
Plant Height
144.0 - 168.0"
Plant Diameter
12.0 - 18.0"
Good Companions
Melon, Cucumber
Bad Companions
Bean
Hardiness Zone
3-10
Disease Resistance
-
Taste Profile
-
Rotation Group
Flowers