Coronation is a leafy vegetable that prefers cooler climates. It does not tolerate heat and is also afraid of frost. Appropriate growth and development temperature range of 8-25 degrees. The most suitable temperature: about 20 during the day, close to 20 degrees when the timely ventilation cooling; night about 14 degrees, close to 12 degrees when the attention of insulation against cold. Humidity is maintained at about 70%. Too little humidity affects growth and development, product quality decline. Too much humidity will cause diseases.

Temperature: Chrysanthemum growth temperature 8 ~ 25 ℃, early spring sowing weather is still relatively cold, and accompanied by the phenomenon of inverted spring cold, so after sowing need to cover the beds on the ground film or the old greenhouse film, surrounded by soil compaction, cold insulation, to be warmer, seedlings out of the ground before the top of the film to be uncovered film. Protected planting more than 25 ℃ to open the vents to release the wind.

Interseeding and weeding: when the seedlings grow to about 10 cm, small-leaved species according to the plant, row spacing of 3 to 5 cm square, large-leaved species according to about 20 cm square between the plucking, while eradicating weeds.

Watering and fertilization: seedlings out of the ground after the start of watering, watering time and frequency to be flexible, in order to keep the soil moist as a standard. Each harvest 10~15 days before the pursuit of 1 time fast-acting nitrogen fertilizer, per mu of potassium nitrate 15 kg, urea 8 kg or so.

Extended information:

Coronation's main pests and diseases are:

1, mildew: Downy mildew is mainly harmful to the leaves, the onset of leaf discoloration spots, with the growth of spore reproduction, the leaves gradually yellow and green, and finally the back of the leaf spots appeared white mold layer, just like the winter frost, so named downy mildew.

Prevention methods: before planting the planting site of the debris collected several kinds of burned, and then the soil deep turning, to eliminate the overwintering of the disease, planting to strengthen the management, increase the application of phosphorus and potash fertilizer, increase the plant's resistance to disease, the onset of the disease with the frost epidemic spirit of the wettable powder 250 times the liquid spraying prevention and control.

2, leaf spot disease: mainly harmful to the leaves, and the onset of irregular spots, spots and whorls, with the development of the disease, spots gradually discolored brown, but also from the leaves spread to the stems and petioles, resulting in planting wither.

Prevention methods: crop rotation with other crops, avoid continuous cropping, choose well-drained plots of land planting, planting additional phosphorus and potassium fertilizer to increase plant resistance, found that the diseased plant in a timely manner will be removed from the diseased leaves. When the onset of the available wuyimycin water 200 times liquid or 6.5% metribuzin dust agent spraying control.

3, aphids: aphids will plant leaves, shoots, buds and other tender parts sucked clean, so that the leaves wrinkled, curled as well as deformed, if the aphids are more serious, it will lead to the whole plant withered or even died.

Prevention methods: before the winter will be the field of weeds and debris centralized burning, to avoid the overwintering of eggs, available to its natural enemies, or spraying diluted aphid mite emulsion agent control.