When it is necessary to bloom in summer, it should be sown from February to march in early spring, preferably under the condition that the temperature and humidity can be controlled. If you plan to sow in the open air, you should sow in the middle of April when the temperature is suitable. When the temperature is suitable, you can sprout in a week or so.
It needs to blossom in autumn, that is to say, to celebrate the national day. It can be sown in July and August. This season's planting of the Persian chrysanthemum, short and strong plants, and neat and beautiful.
The loose and organic rich soil should be selected as the sowing medium, and a certain amount of decomposed organic fertilizer should be applied before sowing.
During sowing, the seeds and a certain amount of sand shall be mixed evenly, and evenly spread on the seedbed, and then covered with soil for about 1 cm. After sowing, the soil humidity should be maintained, and the temperature should be controlled at about 18 ℃ to germinate.
When the seedlings grow 4 to 5 true leaves, they can be transplanted into a nutrition bowl and plucked. There is no need to apply top dressing during the growth period of seedlings, so as to avoid excessive growth of branches and leaves and affect flowering.
The plant type of Persian chrysanthemum is relatively tall, the stem is thin and weak, the flower is big and beautiful, when encountering wind or other bad weather, it will fall down, affecting the ornamental value. Therefore, it is necessary to remove the heart several times and reduce watering during the whole growth process of chrysanthemum, which can not only promote the branching, but also make the plant dwarf and avoid lodging during the growth process.
Summer is the season of fleshy flowers, which is easy to breed diseases and insect pests. Especially in summer, the seedlings are more vulnerable.
The common diseases of Persian chrysanthemum are powdery mildew and grey mould, and the common pests are spider and aphid.
Prevention and control methods: when planting, the density should not be too high, and good ventilation and light transmittance should be maintained; after the disease, the diseased leaves and plants should be cut off and destroyed in time to prevent re infection; spray 1500 times of 15% fenzaning wettable powder, or 1200 to 1500 times of 10% lewubing wettable powder at the early stage of the disease, and use the two drugs alternately for 2 to 3 times.
In the early stage of spider occurrence, spray 40% dicofol emulsifiable concentrate 1000-1500 times.
