What kind of flower is this ah have a picture to listen to people say is chrysanthemum but do not know what varieties.

Latin name: Dahlia pinnata Cav. Alias: Dahlia flower, geranium peony Toyo chrysanthemum English name: Dahlia, Garden Dahlia Family: Asteraceae Compositae Dahlia genus (genus pinyin name) dalihuashu Origin: Dahlia perennial grasses and trees, native to the Mexican plateau, our country began to introduce more than 400 years ago. Mexicans regard it as a symbol of generosity and wealth, so it is honored as the national flower. At present, most of the countries in the world are planted, breeding varieties come out from time to time, with statistics, dahlia varieties to more than 30,000, is one of the world's most varied species of flowers. Flower color and shape of the reputation of a wide range of very complex, the logic is not clear. Morphological features: dahlia color colorful, red, yellow, orange, purple, white and other colors, very attractive. Heavy dahlia has white petals set with red stripes in the thousands of petals

, such as white jade embedded in a pattern of red agate, enchanting. The plant is about 1.5 meters high, the leaves are opposite, pinnately compound. It has numerous yellow tubular florets in the center of the head, the edge of the long and curly ligule, with a variety of brilliant colors, the delicate flowers is shown through it. Dahlia has an enlarged tuberous root, which stores a large amount of nutrients and can be used for its own asexual reproduction. Horticulturists cut the tuber from the neck of the root, a plant, you can get a lot of new plants. There are more than 7,000 varieties of dahlias in almost any color. It has become a world-famous flower and is found in gardens all over the world. Dahlia is also famous for its anti-pollution plants. Growth habit:

Dahlia adapts to different climates and soil quality across the country, with few pests and diseases, easy to manage and best to propagate. It has obvious benefit advantages, fastest growth, longest flowering period, most flowers, and largest flowers, which are larger than peonies by 10-20 centimeters. According to the record of "Chinese Peony", the largest flower diameter of famous peony is 20 centimeters. The maximum flower diameter of fine dahlia is 30-40 centimeters, which is the unique large flower among the current flowers. The largest flower diameter and the smallest plant size, potted dwarf boutique not more than 85 centimeters, such as the crown white peony varieties, plant size not more than 40 centimeters, flower size up to 25-34 centimeters. In the Central Plains, some varieties still have flower buds from May until frost, so if they are moved indoors in front of a window or a sealed light balcony before frost, they can bloom continuously on a yearly basis under the conditions of suitable temperature. Dahlia, also known as dahlia, geranium peony, camas peony, groundnut flower, dahlia, passion flower and chrysanthemum, is a perennial herb in the family of Asteraceae. While chrysanthemums bloom in the frost, dahlias are different, blooming one after another in spring and summer, re-blooming after summer, and withering in the frost. Its flower shape is similar to that of the national peony, colorful, colorful, and attractive. Dahlia is the national flower of Mexico, the city flower of Seattle, the provincial flower of Jilin Province, the city flower of Zhangjiakou City, Hebei Province, the gorgeous and colorful dahlia symbolizes generosity, opulence, and good fortune. Today, its footprints have spread to countries around the world, becoming a regular visitor to the garden, the world famous ornamental flowers. Dahlia (Figure 1)

Dahlia easy to propagate, seeding, cuttings and rooting can be, like sunshine and loose fertile, well-drained soil. Grafting when just budding, you can breed colorful dahlias and dahlias. Dahlia is suitable for flower beds, flower paths or clusters of plants in front of the garden, dwarf varieties can be used as potted plants. The flowers are used to make cut flowers, flower baskets, wreaths and so on. The root contains inulin, which is similar to glucose in medicine. The whole plant can be used as medicine, with the effect of clearing heat and detoxification. China's gardens are commonly cultivated ornamental, usually with the tuberous root propagation or cuttings, can also be sown.

Edit this paragraph distribution area

Dahlia (Figure 2)

Dahlia's hometown is the Mexican plateau region at an altitude of 1,500 meters, it is not hardy, but also afraid of the summer heat, where the climate is warm and cool, and there is a period of low temperatures for the dormant period. Dahlia in China, Liaoning, Jilin and other places with suitable climate, good growth. Dahlia has a thick hammer-like fleshy tuberous roots, plant height depending on the species, leaves opposite, 1-3 times pinnately divided, lobes ovate, serrations coarsely obtuse. Flowers are longer than the top of the peduncle. Dahlia is popular for its long flowering period, from fall to spring, continuous flowering, each flower can continue for 1 month, the flowering period lasts half a year. In the south of China in the spring from February to June open.

Edit paragraph species classification

Dahlia (Figure 3)

Overview

From the flower shape, the dahlia has a chrysanthemum-shaped, lotus-shaped, peony-shaped, crabapple-shaped, etc., the diameter of the flowers of the small ones like the mouth of the size of the wine goblet, and the large ones up to more than 30 centimeters. Their colors, not only red, yellow, orange, purple, light red and white monochrome, there are a variety of more brilliant colors. Dahlia petals have heavy petals and single petals. Heavy dahlia, a kind of thousand-petaled flowers, white petals inlaid with red stripes, like an onyx, extraordinary demonic; and single-petaled varieties of "red century", although few petals, but it seems simple and plain, and a different kind of interest. Dahlia with heavy petals is so elegant and magnificent that it can be compared with peony, so it is also named "Geranium Peony". However, the structure of the flower is different from that of the peony. Peony has large clusters of stamens in the heart of the flower, while the flower of dahlia cannot be called "flower", but only "flower basket" and "flower plate". Because it is arranged by countless small flowers. These florets are the "petals" of the large flowers, and they will open with the successive fruiting. This is the main characteristic of the Asteraceae, as is its close relative, the chrysanthemum. Dahlia (Figure 4)

Dahlia flowers, petals are arranged very neatly, unlike peonies, the size of the intricate, naturally unrestrained and rich in romantic colors. However, there are also dahlias with curly petals, such as a kind of cactus called "cactus", this is the case. There are about 30,000 species of dahlia cultivated all over the world. There are three types of dahlias according to the size of the flower: large-sized (flower diameter of 20.3 centimeters or more), medium-sized (flower diameter of 10.1 to 20.3 centimeters), and small-sized (flower diameter of 10.1 centimeters or less). According to the shape of flowers, it is divided into 11 types of flower types: sunflower type, orchid type, decorative type, round ball type, furious type, silver lotus type, two-color flower type, peony flower type, cactus flower type, pleated type, double-petal flower type, double-petal cosmos flower type, rosette flower type, and other types of flower types. Its main cultivars are:

1. Shouguang

The flower color is bright pink, the apex of the petal is white, the flower is showy, the diameter of the flower is 12 cm, the height of the plant is 110 cm. For summer and fall cut flower varieties.

2. Chao Ying

Flowers bright yellow, white petal apex, overlap round and thick, do not show the center of the flower, flower diameter 12 cm. Plant height 12U cm. Easily cultivated.

3. Lillian

Flowers purplish red, petal apex white, flower diameter 10 cm. Plant height 100 cm, erect. For small cut flower varieties.

4. Hua Zi

Pure purple flowers, diameter 12 cm. The best varieties of purple. Dahlia (Figure 5)

5. Ruibao

Orange-red flowers, do not show the heart, in the shape of a water lily open, flower diameter 12 cm. Very early flowering varieties. It is suitable for greenhouse cultivation.

6. Fushou

Flowers bright red, the apex of the petals have white spots.

7. Jewelry

Summer and autumn vermilion, after October flowers orange-red, flower diameter 12 cm.

8. Xinkong

Flowers bright yellow, petal apex white, many flowers. The plant is 90 centimeters tall.

9. Hongfei

Deep red flowers. Leaves are erect and branched. Easily cultivated.

10. Xinquan

Bright red flowers, white petal edges, beautiful flower shape. Very early flowering variety.

11. Red Hairpin

Pink, petals rounded, rose-shaped, flower diameter 12 cm. The plant is compact and harmonized, very beautiful.

Edited Growth Characteristics

Dahlia (Figure 6)

Dahlia is also known as passion flower and dahlia. To cultivate a good dahlia, you need to master its four major characteristics: (1) like moist and afraid of waterlogging. Dahlia is afraid of drought, avoid waterlogging. This is because the dahlia Department of fleshy tuberous roots, watering too much root rot. But its leaves are large, lush growth, and need more water. If the lack of water wilting can not be supplemented in time after the water, by sunlight, the light edge of the leaves withered, the heavy base of the leaves off. Therefore, watering to master the "dry through watering" principle. (2) Fertilizer is afraid of excessive. Planting dahlias should choose fertile, loose soil, in addition to applying fertilizer, but also fertilizer. Usually from mid to late July until flowering, every 7-10 days to apply a thin liquid fertilizer, and the concentration of fertilizer to gradually increase, in order to make the stem grow more and more robust, leaf color dark green and stretch. (3) Prefer sunlight and fear of shade. Dahlia like full sun. If placed in the shade for a long time will grow poorly, weak root system, thin leaves, thin stems, small flowers, color pale, and even can not bloom. Only by planting it in a sunny place can the plant grow strong and produce bright flowers. (4) Prefer coolness and fear of heat. Dahlia flowering like cool climate, the temperature is about 20 ℃, the best growth. North China and other places planted from late spring to late fall can grow well. But it is afraid of the hot summer sun, especially after the rain out of the sun, which should be slightly shaded, the growth is better.