大丽花(Dahlia pinnata)是菊科的多年生草花,原产墨西哥山区,性喜阳光充足、通风良好的环境条件。在10—25℃气候条件下生长良好。30℃以上高温长势不正常,低于0℃则受冻害。要求排水好的砂质壤土。大丽花是南宁地区元旦、春节、“五一”、“十一”等节日的主要用花。由于长期分根无性繁殖,花朵虽很艳丽,但生长势能却逐渐衰退,花朵也变小,容易发生白粉病等。尤其在10—11月份和4—5 Dahlia pinnata is a perennial flower of Compositae, native to the Mexican mountains, with pleasant sunshine and well-ventilated environmental conditions. Grow well in climatic conditions at 10-25 ° C. High temperature above 30 ℃ is not normal, below 0 ℃ by the cold damage. Requires good drainage of sandy loam. Dahlia is Nanning New Year’s Day, Spring Festival, “May Day”, “Eleventh” and other festivals of the main flowers. Due to the long-term root-clonal propagation, although the flower is very gorgeous, but the potential for growth has gradually declined, the flowers are smaller, prone to powdery mildew and so on. Especially in October-November and 4-5