How to plant the seeds of zinnia?

Zinzinnia generally refers to zinnia, an annual herb of the genus Compositae, native to Mexico, with single, double, curly leaves, wrinkled leaves and horticultural varieties of different colors. It is widely cultivated in various parts of our country, and sometimes it becomes wild. It can be used in flower beds, flower borders, flower belts, and often used in potted plants according to height. Let's take a look at how to plant seeds.

Seed selection

The seed life of zinnia is 3 years, and the germination rate is about 60%. Try to choose the full seeds of the previous year to improve the seed germination rate. When the petals of the outer wheel begin to dry up and the petals of the middle wheel begin to fade, cut off the flower head, dry it and store it.

Disinfection treatment

Before sowing, the soil and seeds should be strictly disinfected to prevent diseases and insect pests during the growing period. the seeds were soaked in 1% potassium permanganate solution for 30 minutes. The matrix is made of 2 parts of rotten leaf soil, 1 part of river sand, 2 parts of peat and 2 parts of perlite, which can be disinfected with 0.05% potassium permanganate or 1000 times formaldehyde, and the soil can be fumigated at high temperature to kill germs, pests and grass seeds.

Sowing time

The sowing time of hundred-day grass depends on the required flowering time, generally sowing in the greenhouse 2-3 months in advance, direct seeding in the open field should be after the severe cold in early spring, otherwise the seedlings are underdeveloped. If the flower bed is used in autumn, it is suitable to sow in summer, spring sowing in March to April, transplanting in 4 to 5 leaves, planting in early June, and flowering from July to Frosts Descent.

Sowing method

Zinnia seeds can be sowed on demand or withdrawn, because they are photophobic flower seeds, they must be covered with vermiculite after sowing, and they can germinate in 3 to 5 days at 21: 23 ℃. There is no need for light during the germination period. After germination, the seedling bed should keep 50% of the water content, not too wet, so as to avoid rotting roots or sudden falling disease.

Seedling management

After the seedlings of zinnia grow out of a true leaf, the seedlings are transplanted once, the root system of zinnia is undeveloped, and the lateral roots are less. Generally, when transplanting 2 true leaves, it should be planted in a pot, and the transplanting substrate should be loose, fertile and well drained. It can be prepared with 3 parts of pond mud, 1 part of rotten leaf soil and 1 part of mature heap manure, and the planting depth is 0.5 cm under cotyledons. After planting, the soil is lightly pressed and watered.