Coriander seeds germinate and emerge from the soil in a few days
The editor brings you related content about how long it takes for coriander seeds to germinate and emerge from the soil and whether it is suitable to cover with film in green plants. Next, the editor will introduce to you.
The time it takes for coriander seeds to germinate and emerge from the soil is greatly influenced by temperature, humidity, and soil conditions. Generally speaking, coriander seeds can germinate and emerge from the soil 7 to 15 days after sowing. If the environmental temperature is maintained between 15 to 25°C (the optimal germination temperature range for coriander) and the soil is moist and loose, usually 7 to 10 days can sprout; if the temperature is low (such as sowing in early spring or late autumn), it may take 10 to 15 days or even longer. In addition, the freshness of the seeds and whether they are pre-soaked will also affect the germination rate.
### Factors Affecting Coriander Germination Speed 1. Temperature: Coriander is a cool-season crop, and the suitable germination temperature for seeds is 15 to 25°C. Germination is slow below 10°C and inhibited above 30°C. In high summer temperatures, shading or heat-tolerant varieties (such as "Four Seasons Coriander") should be chosen, and in winter, seedlings should be raised in a greenhouse or indoors. 2. Seed Treatment: Coriander seeds are double swinger fruits with a hard shell and need to be crushed or soaked to speed up water absorption. It is recommended to: - Crush the seed shell: Gently rub the seeds to split them into two halves. - Warm water soak: Soak in 40°C warm water for 12 to 24 hours, drain after fishing out, and sow, which can shorten the germination time by 2 to 3 days. 3. Soil Conditions: Choose a loose and breathable sandy loam soil and avoid compaction. Deepen the soil before sowing, apply decomposed organic fertilizer (such as sheep manure, earthworm dung), and keep the soil moist but without waterlogging.
### Do You Need to Cover with Film After Sowing Coriander? Covering with plastic film can significantly increase the germination rate, especially in low temperature or dry seasons. Specific operations need to be adjusted according to the environment: 1. Applicable scenarios: - Early spring/late autumn sowing: When the temperature is unstable, covering with plastic film or preserving film can keep the temperature and humidity, increase the soil temperature by 3 to 5°C, and shorten the germination time by 30% to 50%. - Dry areas: Reduce water evaporation and prevent the surface soil from cracking. 2. Film covering method: - Flat cover: After sowing, lightly pat the soil, cover with transparent film (plastic film or household preserving film), and press the edges with soil. - Film management: When 50% of the seedlings emerge from the soil, promptly remove the film to prevent high temperature from burning the tender seedlings; if encountering late spring cold, delay removing the film or make holes in the film for ventilation. 3. Precautions: - Use with caution in summer: Covering with film during high temperature periods can easily cause the soil temperature to exceed 35°C, leading to seed rot. It is recommended to use shading nets or straw mulch instead. - Ventilation check: Observe the moisture inside the film every day, and if there are too many water droplets, briefly lift the film for ventilation.
### Practical Tips to Speed Up Coriander Germination 1. Germination treatment: Wrap the soaked seeds with a damp gauze and place them in a 20°C environment (such as on top of a router) to germinate for 2 to 3 days. After the white sprouts appear, sow and the seedlings can emerge in 3 to 5 days. 2. Shallow sowing and thin covering: Coriander seeds are small, and the sowing depth should be 0.5 to 1 centimeter. Lightly press after covering with soil. Sowing too deep can cause oxygen deficiency and delay seedling emergence. 3. Maintain moisture: Spray 1 to 2 times a day after sowing, or cover with straw or non-woven fabric to keep the moisture. Avoid drenching with water to prevent seed displacement.
### Key Points for Management After Seedlings Emerge 1. Thinning and transplanting: When the seedlings are 3 to 5 centimeters tall, thin the seedlings with a spacing of 5 to 8 centimeters to avoid overcrowding and affecting growth. 2. Water and fertilizer management: - Watering should follow the principle of "dry and wet", with waterings in the morning and evening in summer and at noon in winter. - Top-dressing should be dominated by nitrogen fertilizer (such as diluted urea or soybean cake water), with applications every 10 days during the seedling stage. 3. Disease and pest control: - Root rot: Avoid waterlogging and disinfect the soil with carbendazim before sowing. - Aphids: Spray with chili water or pymetrozine solution.
### Frequently Asked Questions Q: What should I do if the coriander seeds have not germinated after a week? - Check if the seeds have rotted (observe for mildew when pinched open), and if they are bad, they need to be re-sown. -掘开表土确认是否缺水，若土壤干燥可浇透水后重新覆盖薄膜。 Q: Why is the seedling emergence uneven after covering with film? - It may be due to uneven covering thickness or high temperature inside the film. You can locally remove the film for ventilation and spray water to promote seedling growth.
By adjusting sowing methods and management measures, the seedling emergence rate and growth speed of coriander can be significantly improved. Rational use of film covering technology, combined with temperature and humidity control, can achieve efficient planting all year round.
The comprehensive knowledge explanation of coriander germination and whether it can be covered with film provided above is hoped to help you.