Find out when and how to plant cosmos.

? The sowing date of cosmos should be February-March in early spring, mid-April in the open air, and July-August if it needs to bloom in autumn. When sowing, the seeds and sand are mixed and sown on the seedbed, covered with soil to keep the soil moist, and no fertilization is needed during the seedling growth period.

Seasonal selection

When flowering is needed in summer, it should be sown in February-March in early spring, preferably under the condition of controllable temperature and humidity. If you plan to sow in the open air, you should sow in mid-April when the temperature is suitable. When the temperature is right, seedlings can emerge in about a week.

Flowers need to bloom in autumn, that is, to celebrate the National Day, and can be planted in July and August. The cosmos planted in this season is solid, neat and beautiful.

Soil selection

Sowing medium should be loose soil rich in organic matter, and a certain amount of decomposed organic fertilizer should be applied before sowing.

When sowing, the seeds are evenly mixed with a certain amount of sand, evenly spread on the seedbed, and then covered with soil for about one centimeter. After sowing, soil moisture should be kept and the temperature should be controlled at about 65438 08℃ to germinate.

Seedling maintenance

When the seedlings grow 4-5 true leaves, they can be transplanted into a nutrition bowl and the heart can be taken out. There is no need for topdressing during the seedling growth period, so as not to cause the branches and leaves to grow white and affect flowering.

Cosmophilus is tall, with slender stems and large and beautiful flowers, which will fall down when encountering wind or other bad weather, affecting its ornamental value. Therefore, in the whole growth process of cosmos, it is necessary to pick the seeds many times and reduce watering, which can not only promote branching, but also dwarf the plants and avoid lodging during the growth process.

Eliminate pests and diseases

Summer is the season when flowers and meat are most prone to diseases and insect pests, and cosmos is no exception. Sowing seedlings, especially in summer, are more fragile.

Common diseases of cosmos are powdery mildew and gray mold, and common pests are red spider and aphid.

Prevention and control methods: the density should not be too large when planting, and good ventilation and light transmission should be maintained; After the onset, the diseased leaves and plants should be cut off in time to prevent further infection; Spraying 15% triamcinolone acetonide wettable powder 1500 times or 100% lewubing wettable powder 1200 to 1500 times at the initial stage of onset, and using the two drugs alternately for two or three times.

At the early stage of the occurrence of red spider, spraying 40% dicofol EC 1000 to 1500 times.