How to breed sunflower?

First, the cultivation method of sunflower

1, the best breeding time

The best sowing and breeding time of sunflower is spring, summer and autumn.

2, the best growth soil

Sunflowers are suitable for poor soil, thin soil and general soil. Of course, it is best to choose sandy soil with good drainage for breeding.

3, growth temperature and humidity requirements

The amount of watering should not be too much, just keep the soil slightly moist and take drainage measures to prevent water accumulation; When sprouting, the temperature should be controlled at 2 1-24 degrees and 7- 10 degrees. Because the seedlings are weak, it is necessary to maintain a high temperature, which is conducive to the rapid growth of seedlings and the formation of thick and fleshy branches and leaves.

4, the best growth light

Sunflower is a potted plant that prefers warm sunshine environment, so when placed, it must ensure enough light time, and never put it in a damp and dark place.

Second, the matters needing attention in cultivating sunflower

1, fertilization

Because sunflower has low requirements for fertilizer, it is easy to treat sunflower when fertilizing. Applying 0. 1% potassium dihydrogen phosphate every half month can make the sunflower bloom brightly and continuously.

2, watering point

A. Growth stage: frequent watering is not required.

B, seedling stage: If the weather is not very hot and the evaporation of water is small, you can't water too much.

C. Flowering period: Because the flowering period is in dog days, the weather is hot and the evaporation of water is large, so it needs to be thoroughly watered and fully absorbed when watering.

3, pruning essentials

When the seedlings grow to 3-4cm, cut off the tip of the main branch, and soon new branches will grow at the wound. When the branches at the roots grow to a certain length, the tips of the branches can be cut off, so that the plant shape of the sunflower becomes beautiful.

4, basin soil replacement

A. Base fertilizer: prepare the base fertilizer before moving the pot, and the expired sesame powder and fish sausage (fermented) can be used as the base fertilizer.

B, culture soil: add 3 parts of rural cooked soil, 5 parts of yellow sand, 2 parts of chaff ash or fine sawdust and a small amount of calcium superphosphate powder, and mix evenly.

5, breeding points

First, sowing

When sowing, it is best to choose when the temperature is above 20 degrees. After sowing, it will be covered with thin soil and germinate ten days later. When raising seedlings, each plant should be planted with a row spacing of 5×6cm, and liquid fertilizer should be applied regularly. In the growth environment of 15 degrees, it blooms in about 20 days.

B, cutting propagation

Select double petal varieties. In summer, the cut branches will be used as cuttings, and buds will appear after cutting propagation. When cutting and transplanting, you don't need to bring soil with you. When the fruit is ripe, it will crack. At this time, the seeds are easy to scatter, so it is necessary to harvest them in time.

6, pest control

First, aphids

It mainly occurs before germination, so imidacloprid 4000 ~ 5000 times solution can be used in the flower bud expansion period, imidacloprid 4000 ~ 5000 times solution and cypermethrin 2000 ~ 3000 times solution can kill aphids after germination, and can kill aphids 1500 times solution after fruit setting.

B. crustaceans

Spray 50 ~ 80 times oil emulsion before germination and in late May, and add 1500 times dextran.

Third, the experience of cultivating sunflowers

1, seedlings overwinter.

After the first frost solar term, the sunflowers should be moved to a sunny place indoors. After Tomb-Sweeping Day the following year, you can put it outside the window. If there is cold weather, they can move to the window for maintenance.

2. Maintenance at ordinary times

Although it is not necessary to water frequently, it is necessary to maintain a certain humidity and apply 0. 1% potassium dihydrogen phosphate every half month.