Marigold is a common landscaping flower with large flowers and long flowering period. It is often used to decorate flower beds, squares, arrange flowers, flower borders and cultivate flower fences. It is also often used as a potted flower in the courtyard. The maintenance of marigold in the garden is very important. It is very important for all flower lovers to pay attention to the maintenance skills!

1 morphological characteristics:

It belongs to panicum miliaceum of Tagetes genus in Compositae, with erect and stout stems, slender longitudinal ribs and spreading branches upward. Leaf pinnate division; There are a few glands along the leaf margin. Head solitary; Involucre cup-shaped, with a pointed tip; Lingual flowers are yellow or dark orange; Tubular flower corolla yellow. Achene linear, base narrowed, black or brown, short and slightly hairy; The crest has 1-2 long awns and 2-3 short and blunt scales. Flowering period is July-September.

2 maintenance points:

1. Key points of field management:

Shallow hoeing can conserve moisture. When the seedling is 25-30 cm high, a small amount of branches appear. Soil is taken from furrows and cultivated at the base of the plant to promote adventitious roots, prevent lodging and inhibit the growth of weeds under the film. Water according to the soil moisture after soil cultivation, and the amount of water should not be too large each time, so as to keep the soil dry and wet. Top dressing outside the roots when the flowers are in full bloom, and the spraying time is better after 6 pm.

2. Key points of potted plant management:

Because marigold plants are not very tall, it is very suitable for family potted plants, which need fewer seedlings and generally do not need pre-seeding. You can sow directly in a flowerpot. Make the soil in the flowerpot solid, and water it thoroughly. When the water permeates, sow the seeds on it, and also cover it with a thin layer of soil. If the temperature is not high, you should keep warm. There should be neither too much seedling nor too much fertilization.

3 common pest control:

1. Powdery mildew: it invades young leaves, and white powder appears on both sides, and the early symptoms are not obvious. After 3-5 days of white powder layer, the leaves are waterlogged, gradually turning green and yellow, and when severely injured, they will fall off. During the onset period, a bottle of Qilin Jingbai can be sprayed with 30-45 kg of water to prevent powdery mildew.

2. Black spot disease: it mainly affects leaves, petioles and tender tips. When the leaves are first attacked, purple-brown to brown spots appear on the front, and most of them are round or amorphous black-brown spots after expansion. You can use Qilin Qihu and Semli for comprehensive prevention and control.

3. Spiny moth: mainly the larvae of yellow thorn moth, brown-edged green thorn moth, red brown thorn moth, mulberry brown thorn moth and flat thorn moth, which eat a large number of leaves in high temperature season and are controlled by uniform spraying with a net dilution of 800- 1000 times.

4. The main species are Tagetes erecta, Myzus persicae, etc. They suck the sap from the tender organs of plants, which harms the tender stems, young leaves and flower buds, and seriously affects the growth and flowering of plants. Use Qilin Zhiru diluted 500-600 times for efficient prevention and treatment.