Cool Sunflower Flower Growing Conditions 9+
Extremely high temperatures have been shown.
sunflower flower growing conditions. Sunflowers are annuals that grow well in fertile well-drained soil. Average humidity is best for healthy plants. Temperatures less than 28F are required to kill maturing sunflower plants.
To reach its potential in size and seed production a sunflower needs fertile soil regular watering and a pH of 60-75. The best time to plant sunflowers is just before the soil reaches this temperature. Conversely cool weather stops the Mexican sunflower in its tracks.
Dec 14 2018 Sunflowers thrive in warmer weather and climates. Most sunflowers germinate when soil has reached 70 to 85 degrees F. They have long tap roots that need to go several feet into the ground so sunflower plants prefer loose well-drained somewhat alkaline soil with a pH of 60 to 75.
When nighttime temperatures are in the 60s its the right time to grow Mexican sunflowers. Most importantly they love being planted. They are remarkably tough and will grow in any kind of soil as long as it is not waterlogged.
Sunflowers grow best in locations with full sun. Mexican sunflowers love hot weather even days with triple digit temperatures. Poke your finger in the soil to make a hole for your sunflower seed.
Optimum temperatures for growth are 70 to 78F but a wider range of temperatures 64 to 91F show little effect on productivity. Before planting we enrich the soil with compost made from among other organic material poop from our chickens. However the optimal temperatures for growing sunflowers is between 70.