How Late Can You Plant Sunflower

Sunflowers need full sun and a location that has well-drained soil with a pH of 6.0 to 7.5. They are a relatively deep-rooted plant,

the soil should be loose and easy for the roots to grow. You can test your soil’s drainage by digging a hole that is 12″ wide by 12″ deep.

Fill the hole with water and let it drain. Fill it again and observe how long it takes for the water to drain.

If the water drains within six hours, then you have well-drained soil. If it takes longer than six hours, you will need to amend your soil with organic matter such as compost or peat moss to improve drainage.

Sunflowers are relatively tolerant of poor soils, but they will not do well in soggy soils that stay wet for long periods of time.

When planting sunflowers, it is best to sow the seeds directly in the ground after all danger of frost has passed and the soil has warmed up.

Sunflower seeds can be planted as early as two weeks before the last frost date in your area, but they will not germinate if the soil temperature is below 55 degrees Fahrenheit.

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