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How to raise sunflower in pot

For sunflower this plant, we are certainly not unfamiliar, we usually eat melon seeds, sunflower oil for cooking are from sunflower seeds. And the sunflower disk is also very beautiful, is a very popular ornamental plants, and its meaning day. So how to raise the sunflower at home? What's the way? The following small series introduces the maintenance method of potted sunflower.

How to raise sunflower

1. Soil: sunflower is not strict on soil, it can grow on all kinds of soil, from fertile soil to dry land, barren, saline alkali land. It has strong salt and alkali resistance.

The best basin soil is sandy soil rich in humus and well drained. In order to make the plant recover quickly, we should apply enough base fertilizer at the bottom of the pot when planting, and take more soil and less root damage when digging seedlings.

2. Temperature: sunflower like warm environment, not resistant to shade, not cold. The optimum temperature for its growth is 21-27 ℃ in the daytime and 10-16 ℃ at night. If the temperature is low in early spring, the plant growth is slow, which directly affects the flowering time. If the temperature is over 30 ℃ in the growth period, the stem and leaf will grow excessively and the flowering period will be shortened if the temperature difference is too small.

3. Water: sunflower plant tall, leaves and dense, is more water consumption crops, growth period to timely watering, otherwise leaves easy to dehydration wilt. But should not be too wet, humidity is too high, the base leaf is easy to yellow. Always keep the soil moist, especially in high temperature and drought in summer.

4. Light: sunflower is a short day crop, but it is not very sensitive to sunlight. Sunflower likes sufficient sunlight, and its seedlings, leaves and flower plates all have strong phototropism. Such as continuous rain or long-term growth in a semi overcast environment, stem is not straight, leaves soft, drooping, yellow green, small and irregular disk.

5. Fertilizer: fertilize once every 20 days in the growing period, but topdressing 2-3 times of thin phosphorus and potassium fertilizer before flowering.

During the growing period, fertilize once a week: planting and maintenance. When the seedlings are fully grown, they will be thinning one after another, and one plant will be left in each hole. When the height of the seedlings is 7 to 8 cm, they can be planted.

6. Pick bud: make the main branch top bud robust growth and development, can pick (axillary) bud. For the stem slightly higher should be set up a pillar to prevent wind lodging. If you don't care about potted plants, single flower is better. The height of potted high stalk varieties can be controlled by spraying 0.25% - 0.4% B9 solution on the leaves 20 days after germination. If the flower bed is ornamental, it can be pinched once, and the branches can produce 4-5 flowers.

7. Pest control: the incidence of sunflower pests is low, the main diseases are powdery mildew, black spot, bacterial leaf spot, rust (prevalent in high humidity period) and stem rot. When powdery mildew occurs, the leaves begin to produce white round powdery spots, which expand and form a piece. Later, brown dots appear on the powdery layer, and the plant growth stops. When black spot disease occurs, dark brown or light yellow spots of different sizes appear on the leaves, and then develop into brown spots, which are connected to form large patches, making the leaves black and withered. It can be prevented by disinfection of the substrate, reasonable watering, increasing air circulation, intermittent spraying of protective fungicides and other methods. In the early stage of the disease, it can be sprayed with 500 times of 50% thiophanate methyl WP or with the same amount of Bordeaux solution.