Sunflowers
Sunflowers turn towards the sun only when they are young plants. As flowering begins, the stem hardens. A cut sunflower in a vase no longer makes this movement, so it does not need turning towards the light during the day.
Sunflowers turn towards the sun only when they are young plants. As flowering begins, the stem hardens. A cut sunflower in a vase no longer makes this movement, so it does not need turning towards the light during the day.