1, Petunia cultivation method
Sowing: If Petunia is to be cultivated, it is best to choose April-June in spring or June in autumn 10- 1 1, which is very suitable for growth and easy to survive. After sowing, attention should be paid to maintaining a ventilated environment, which will germinate in about 3-8 days.
Temperature: During the growth period, a good growth trend can be maintained by keeping the temperature between 20-24℃, and the lowest temperature shall not be lower than 15℃. If it is kept in a low temperature environment for a long time, it will affect the flowering time and even lead to failure to bloom. Therefore, if it is cultivated in the north, it is necessary to put the plants in a warm place.
Lighting: Petunia is more resistant to sunlight, and it can also resist high temperature and sunlight in summer, so it doesn't need shading during the growing period. Maintaining reasonable lighting can make it grow more vigorously. If you keep it outdoors, you need to move indoors in time in rainy days.
2. Petunia cultivation precautions
Pests: Petunia's diseases are mainly seedling blight and stem rot in growing period, and the main pests are cabbage caterpillar, aphid, leaf roller moth and so on. Rhizoctonia solani can be controlled by 800- 1000 times of chlorothalonil and thiophanate-methyl, but aphids generally can't spray fenvalerate, which is easy to cause phytotoxicity and affect their growth.
Pruning: Petunia shoots when the seedling grows to about 10 cm high, so that it grows lateral branches and flowers more. If you don't need to keep seeds after each flower withers, you should cut off the residual flowers and branches in time, and then you can continue to sprout side branches and keep flowering.
Morphological characteristics of Petunia hybrida
Petunia of Solanaceae. Perennial herbs, usually planted once or twice a year; Plant height 15-80cm, and there are also tufted and creeping types; Leaves elliptic or ovoid; After sowing, it can bloom in the same year and last for several months, and the corolla is trumpet-shaped; The flower shape has single petal, double petal, wrinkled petal or irregular sawtooth; Colors are red, white, pink, purple and various spots, meshes, stripes and so on. Capsule, the seeds are very small, and the 1000-grain weight is about 0.1g.
There are many varieties of horticulture, which can be divided into high-yield species, low-yield species, tufted species, creeping species and erect species according to plant characteristics. According to the pattern, there are: large flowers, small flowers, wavy, serrated, double petals and single petals; According to the color, there are: purple, red, pink, pure white, flesh color and a variety of striped varieties (red and white stripes, light blue and red stripes, pink and white stripes, etc. ).