2, prepare the soil. The soil used for sowing is very loose and hopefully contains some organic matter. For better growth, it is good to add a little organic fertilizer before sowing.
3. Sow the seeds. Spread the seeds evenly in the pot, and cover with thin soil when watering in order to keep the seeds from being washed away. After planting, put it in a cool place, and it will germinate in a week or so.
4. Seedling management. If 4 to 5 leaflets appear, it can be transplanted. Seedlings can't be fertilized before they grow, and they can't be exposed to the hot sun.
5, watering. Cosmos is highly adaptable. A week after planting does not require watering. Seeds out of seedlings, watering every week. In order to keep the soil moist, it is not ideal to spray too much water mist at a time in a microfine spray.
6, fertilization. Cosmos does not require much fertilizer, only one application of diluted nitrogen fertilizer before flowering.
7, the temperature of light. Cosmos likes to be exposed to sunlight, and is a light-loving plant that needs proper shade in summer. The best flowering temperature of cosmos is 22℃～28℃. Water evaporates quickly in summer, and the plant needs to be kept moist frequently.