1、 When do sunflowers bloom

Sunflower, also known as sunflower and sunflower, is an oil crop native to Europe. Its flower shape is similar to the sun and its color is golden yellow

1. Flowering time

If the flowers are sown in April every year, the flowering period of sunflowers is from July to August of that year, and the seeds will mature from August to September. In addition, it can bloom all year round through accumulated temperature. As long as the temperature is enough, it can bloom. Potted sunflowers usually open in June every year

2. Flowering mechanism

It usually takes six to nine days for a sunflower to fully open. Generally, the second day to the fifth day after flowering is its full flowering period. It has a large number of flowers and high ornamental value

3. Flowering morphology

Sunflower flowers have single petals and double petals. They look like a large disk. The flowers have a variety of colors, including golden yellow, orange yellow and purplish red. The disc has tongue shaped and tubular flowers

4. Flowering management

After the sunflower is in full bloom, we should ensure that there is enough light in its growing environment. If potted, it's best to breed on the sunny balcony and water it in time to ensure sufficient water supply. In addition, there is timely fertilization. Urea and diammonium can be applied once a week to supplement nutrients

And pay attention to preventing locusts. Sunflower will attract many insects after flowering. The most important one is sunflower borer, which feeds on sunflower seeds. The flower plate will fester after rain. The talc powder can be diluted to make dust agent for spraying, which can be sprayed once every two or three days

2、 Pictures of sunflowers