What are ideal growing conditions for sunflowers?

Sunflowers flourish under the right conditions to produce their iconic blooms. As a true sun-worshipper, a sunflower requires full sunlight for 6-8 hours of the day to create strong stems and quality blooms. Using well-drained soil with a neutral pH will help reduce root rot, and maintaining adequate spacing will also aid in preventing disease. Keeping the soil warm (above 50°F or 10°C) will help the plant grow vigorously from seed to bloom.

Before sowing seeds, prepare the planting sites to test the drainage. To do this, dig 12-inch holes and fill them with water to test the drainage. A good site will drain within 2 hours. Amend the soil with 3 inches of compost when preparing the site and work the compost in to a depth of 8 inches. For wet areas of the garden, I will create small mounds for each seed to improve drainage.

Maintain consistent soil moisture without excessive water; water plants when the top inch of soil feels dry, typically twice a week. Use drip irrigation to ensure the roots receive water, not the leaves, mulch with straw to conserve moisture and suppress weeds. Increase watering frequency just slightly as buds form for bigger blooms.

Track soil temperature during the growing season. Use a thermometer to measure the temperature at a 4-inch depth. Soil temperatures below 50°F will stall growth, while temperatures above 85°F will cause the plants to wilt and require extra irrigation. Shading plants in the afternoon for those in hot climates will help them avoid heat stress. Record soil temperatures daily to help you adjust your care to meet your plants' requirements.

Read the full article: When to Plant Sunflowers: Full Guide