What are the seed planting methods of Dahlia in the subfamily Tubulae? What if it doesn't blossom? What varieties do you have?

Dahlia, perennial herb, Dahlia is one of the most famous flowers in the world, which is planted in most countries in the world. So do you know the planting methods of dahlia seeds? What if it doesn't blossom? What varieties do you have?

I. seed planting method of Dahlia

1. Pre-broadcast preparation

(1) seeding container

Choose a seedling tray that is 50 cm long, 20 cm wide and 5 cm high, and rinse with clean water first. Then disinfect it with 0.2% chloronitrobenzene.

(2) sowing substrate

Choose fine, uniform, stone-free, pollution-free, nutrient-rich, pest-free soil. It is suitable for the soil with good drainage and light saline-alkali. The selected sowing substrate is garden soil and peat. It is generally made of garden soil, humus and river sand in the proportion of 2:2:1 and sterilized with 2% pentachloronitrobenzene or high temperature.

2. Sowing method

(1) sowing time

Wash the sterilized seedling tray with clean water before sowing. Sow seeds immediately after the water seeps. The hotbed was sown in the middle and late March, and the flower bed varieties were sown in the open field in late April, and the seeds were scattered on the soil surface. After sowing, the large seeds were covered with moist fine soil, and the thickness was 3 times of the seed diameter. After sowing, bamboo pole is used to cover agricultural film, leaving gaps for ventilation, which is beneficial to increase soil temperature, reduce moisture, maintain soil moisture and reduce soil consolidation, so as to maintain the temperature and humidity needed for seed germination. After sowing, the seeds can germinate after about 7 days after sowing, and the soil moisture should be maintained frequently. When the seedlings grow to 4cm, the seedlings should be watered thoroughly, placed in the shade for 3-4 days, and then moved to strong light. Pay attention to timely watering to maintain soil moisture.

(2) Post-broadcast management

Water according to soil moisture. Keep the soil dry and moist when the soil surface is slightly dry, keep it moist by immersion method. The optimum temperature for seed germination is 19: 21 ℃. It is often ventilated after sowing, which is conducive to seed germination. Dahlia seed germination needs proper shade, after the emergence of neat seedlings, gradually remove the film, and move the seedlings to a sunny place. 180 °turning box every 2-3 days is beneficial to the upright growth of seedlings.

What if Dahlia doesn't blossom?

1. Cause analysis

(1) improper maintenance

Sunlight, watering, temperature and other factors may lead to poor growth of dahlias. Insufficient sunlight or too much watering will cause the plant to grow excessively, with only leaves but no blossoms. Excessive fertilization or wet pot soil will cause dyspnea in the root of the plant, and root rot will also affect flowering.

(2) infection of diseases and insect pests

In the flowering period of Dahlia, that is, flower bud differentiation, if you receive diseases and insect pests, flower buds are difficult to differentiate, it is difficult to bloom.

2. Solution

(1) strengthen the lighting

Sufficient light is the key to planting dahlias, lack of light will cause branches to grow and thin, because of the lack of nutrients in the plant, it can not blossom or blossom less.

(2) strengthen fertilization.

Sufficient basal fertilizer must be applied before planting or before plant germination. If the base fertilizer is insufficient, the times of topdressing can be increased appropriately.

(3) strengthen anti-freezing.

If in relatively cold areas, the ground should be covered with some withered grass after winter, or the roots of dahlias should be dug out to dry and stored indoors, and then potted or planted before and after the Qingming Festival in the second year.

What are the varieties of dahlias

There are many varieties of dahlias, with about 30,000 species in the world. According to the size of flowers, they can be divided into three types: large flowers (more than 20.3 cm in diameter), medium flowers (10.1 to 20.3 cm in diameter) and small flowers (less than 10.1 cm in diameter). According to the flower shape, it can be divided into 11 flower types: sunflower type, orchid type, decorative type, spherical type, blooming type, anemone type, bicolor flower type, peony flower type, cactus flower type, wave fold type, double petal flower type, double Persian chrysanthemum type, rosette flower type and other flower types.

The main cultivated varieties are:

Shouguang: fresh pink flowers, white petals at the end, gorgeous flowers, flower diameter 12 cm, plant height 110 cm. It is a cut flower variety in summer and autumn.

Morning Shadow: bright yellow flowers, petal apex white, overlapping round and thick, not showing the heart, flower diameter of 12 cm. The plant is 120 cm high. Easy to cultivate.

Beauty: purplish red flowers, petal apex white, flower diameter of 10 cm. The plant is 100 cm tall and erect. It is a small cut flower variety.

Hua Zi: pure purple flowers with a diameter of 12 cm. The best variety in the purple line.

Ruibao: orange-red flowers, not showing their hearts, blooming in the shape of water lilies, with a diameter of 12 cm. Very early flowering variety. It is suitable to be cultivated in greenhouse.

Fushou: the flowers are bright red and the petals are marked with white marks at the apex.

Jewelry: scarlet in summer and autumn, orange-red flowers after October, flower diameter 12 cm.

Xinhuang: bright yellow flowers, white petals at the apex, many flowers. The plant height is 90 cm.

Red concubine: dark red flowers, erect leaves, many branches, easy to cultivate.

Xinquan: bright red flowers, white petals, beautiful flowers, very early flower varieties.

Red hairpin: pollen color, petals round, rose-shaped, flower diameter 12 cm. The plant is compact and coordinated and very beautiful.

Time: 2019-03-18 Click: