Dahlia is a perennial herb of Dahlia in Compositae, native to Mexico. Its stems are upright, about 150-200cm high, and the colors are divided into white, yellow, orange, red, purple, ink and multicolor. Flower patterns are divided into blooming, anemone, two-color flowers, sunflower, orchid, decoration and spherical.

First, the basic introduction of Dahlia

1. Dahlia, also known as Dali Flower, Dahlia Flower, Sweet Potato Flower and Oriental Chrysanthemum, is a perennial herb of Compositae and Dahlia.

Dahlia originated in Mexico and is one of the most widely cultivated ornamental plants in the world. Introduced to China in the early 20th century, it has been cultivated in many provinces.

Second, the basic characteristics of Dahlia

1, rhizome: Dahlia has huge rod-shaped roots, with erect stems and many branches, about 150-200cm high.

2. Leaves: Leaves 1-3 are pinnately divided, the upper leaves are sometimes undivided, the lobes are oval or oblong, the lower part is grayish green, and both sides are hairless.

3. Flowers: big head, long peduncle, about 6-12 cm wide; The outer layer of involucral bracts is about 5 layers, oval, leafy, and the inner layer is oval-lanceolate and membranous. Tongue flower 1 layer, white, red or purple, oblong, with inconspicuous 3 teeth at the top, or entire. Colors are divided into red, purple, white, yellow, orange, ink, multicolor and so on. Patterns are divided into sunflower, orchid, decorative, spherical, blooming, anemone, bicolor, peony, cactus, wavy, double-petal cosmos, rosette and other patterns.

4. Fruit: The fruit is oblong, about 9- 12mm long and 3-4mm wide, with black color and two inconspicuous teeth.

Third, the growth habits of Dahlia

1, temperature: the growth temperature range is 8-35℃, the suitable growth temperature range is 15-25℃, and the stems and leaves wither rapidly after frost.

2. Illumination: Dahlia likes light but is not tolerant to shade, and the illumination duration is generally around 10- 12 hours. Too short light duration will affect the branching of Dahlia stems and leaves and the formation of flower seedlings, while too long light duration will hinder the production of flowering hormones, which is not conducive to flower bud differentiation.

3. Moisture: Dahlia has poor drought and waterlogging tolerance. As long as the soil is kept moist during the seedling stage, and according to? Dry and wet? The principle of timely replenishment of water.

4. Soil: loose and fertile sandy loam with good drainage, suitable for cultivation, and the soil ph value is controlled between 6.7 and 7.8.