Seed price and planting method of Dahlia

Dahlia, also known as Dahlia, Oriental Chrysanthemum, Dahlia, etc., is a perennial herb of Compositae. It is native to Mexico. Mexicans regard it as a generous and rich symbol. It is now planted in most countries in the world. It is suitable for flower beds, flower paths or pre-court cluster planting. Dwarf varieties can be used as potted plants. Let's take a look at the seed price and planting method of Dahlia.

How much is the dahlia seed per jin?

The price of dahlia seeds is about 200 yuan and 300 yuan per jin, but the prices vary greatly due to the variety and quality of dahlia seeds. Seed propagation of Dahlia is suitable for varieties that are easy to bear fruit. Generally, seeds harvested in autumn are sown from February to March of the following year, 15: 20 ℃ in daytime and no less than 12 ℃ at night. The seedlings propagated by seeds have strong vitality, healthy growth and development, strong adaptability, and can obtain a large number of plants in a short time, but blossom and bear fruit slowly, florescence is relatively late, can not maintain the excellent characteristics of the female parent, there is a phenomenon of degradation.

Sowing method of Dahlia

1. Sowing substrate: seedling tray for dahlia sowing container, rinse with clean water first, and then disinfect with 0.2% chloronitrobenzene. The sowing substrate is generally made of garden soil, humus soil and river sand, with a proportion of 2:2:1, and sterilized with 2% pentachloronitrobenzene or high temperature.

2. Sowing time: wash the seedling tray with clean water before sowing, sow immediately after water infiltration, sow in the hotbed in mid or late March, flower bed varieties are sown in late April, the seeds are all scattered on the soil surface, and the seeds can germinate in about 7 days.

3. Post-sowing management: regular ventilation after sowing of Dahlia is beneficial to seed germination. After emerging neatly, the film should be gradually removed and the seedlings should be moved to a place with plenty of sunshine. 180 °turning box every 2-3 days is beneficial to the straight growth of seedlings. When the seedlings grow to 4cm, the seedlings will grow.

The planting method of Dahlia

1. Temperature management: dahlias like cool climate, and 10: 25 ℃ is the most suitable. In early spring, the temperature in the daytime is maintained at about 25 ℃ for early flowering. When it exceeds 25 ℃, it must be ventilated and cooled down. When the temperature is below 10 ℃ at night, the temperature in the greenhouse should be increased, and cooling measures should be taken in the high temperature season.

2. Timely fertilization: Dahlia is a fertilizer-loving plant, and there must be sufficient fertilizer supply, otherwise it is easy to cause flowers to become smaller, color dim and ornamental. According to the growth situation, cake fertilizer should be applied for 4 times, thin fertilizer should be applied, and fertilization is prohibited when the high temperature exceeds 30 ℃ in summer.

3. Water management: the proper reduction of watering amount of dahlia is beneficial to control the growth of the plant, promote the stem of Dahlia to be thick, the plant short and the flower large, spray water on the leaf surface as much as possible under the condition of basically satisfying its water content in summer high temperature, at least twice a day, to make up for evaporation loss.

4. coring and pruning: Dahlia leaves a single bud into a single plant to make it blossom early, leave 1-2 nodes short after flowering, and the new buds can continue to blossom. The varieties with poor branching were coring in the young stage to promote their branches, and the plants were truncated from the middle of July to the first ten days of August.

5. Florescence control: if dahlias are to bloom in winter and early spring, sunshine and temperature must be controlled. Cut flowers with large colors can be produced when the sunshine in winter is about 14 hours and the night temperature is more than 10 ℃.

6. Harvest of cut flowers: the suitable time for picking dahlias is when they bloom at 3-4 minutes. In spring, the first batch of flowers is cut with 2 sections, and the second batch with one section. It is easy to choose to harvest in the morning or evening, insert it into water immediately after harvest, and store the root in a dry place after harvest.

Disease and pest control of Dahlia

1. Root nodule disease: disinfect the soil with 2.5 kg Bordeaux solution and 10 g Selisan with 1 kg / square meter.

2. Brown spot: spray 0.5 °Be stone sulfur mixture, or spray 65% wettable Dysen zinc 500x solution.

3. Powdery mildew: spray with 0.2-0.3 °Be stone-sulfur mixture, or 40% carbendan 500x solution.

4. Botrytis cinerea: it can be sprayed with 75% chlorothalonil wettable powder 500 times, once every 10 days or so, even 3 times for 4 times.

5. Mosaic virus: spray 50% malathion 1000 times, 40% dimethoate 1500 times or 25% carbaryl 800 times.

6. Heart borer: the diseased plant can be disposed of in time and can be sprayed with 1500 times liquid of parathion.

7. Aphids: can be sprayed with 40% dimethoate 1000-1500 times or 50% aphid pine 1000 times.

8. Red spider: you can spray water on the leaf surface, or you can spray it with 40% dimethoate 1000-1500 times.