How frequently should sunflowers be watered?

Adequate watering enables sunflowers to thrive through summer heat. Water deeply 1-2 times per week when the top inch of soil is dry. This will encourage the roots to grow deep, in search of moisture. Daily watering can lead to issues such as root rot. Only increase frequency during heat waves.

Before watering, always check the soil moisture by inserting your finger to a depth of about the second knuckle. If the soil feels dry, water it until it is thoroughly soaked. I use a soil moisture gauge for precision. Proper drainage allows for water to escape and prevents soggy soil, which suffocates root systems. Sandy soils drain faster and require more frequent watering than clay soils.

Watering early in the morning, or at least before the heat of the afternoon, will help reduce the potential for water evaporation. Do not do evening watering, which leaves the foliage wet overnight, as it can harbor fungal diseases (such as powdery mildew) from moisture overnight. Soaker hoses or drip irrigation systems shorten the time and reduce water usage. Dawn is when I water my garden so I can watch the sun rise. Container plants typically require less watering than in-ground plants.

Be vigilant for signs of over- or underwatering. A common sign of over-watering is yellowing leaves on your sunflowers. Supplying too little water will cause wilting during the heat of the day. If you see curled leaves, it indicates water stress. If you notice any of these signs, adjust your schedule slowly. If well-watered, sunflowers should be erect and green.

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