1、 Breeding environment

1. Soil: select loose soil with good drainage for breeding. If the drainage is not good, it is easy to cause root rot due to excessive ponding

2. Watering: the soil is too dry or too wet. Just keep the soil slightly wet. Generally, it is necessary to water every day when it is sunny, and a large amount of water is required during the growth period and when the temperature is high, so the amount of watering should be increased appropriately. However, if you water too much, it will also produce ponding and lead to rotten roots. You must pay attention to it

3. Light: dahlias need plenty of sunshine. It's best to accept more than 6 hours of light every day. Only sufficient sunshine can grow better. If it is kept in a dark or sunless place for a long time, it will grow poorly

4. Temperature: generally, it can grow normally at 5-35 ℃. If you want it to blossom and grow better, you'd better control the temperature at 10-25 ℃. This is the most suitable temperature for dahlia. Too high or too low is unfavorable to its growth

2、 Breeding method

Cutting propagation: keep one of the sprouts from the divided roots, and the other buds can be cut when they grow to 3cm; When the unearthed seedlings grow to 5cm, choose a healthier one to grow, and the others can be cut. The temperature should be controlled at 20 ℃ and a certain humidity should be maintained. It can take root in about half a month

3、 Common diseases and insect pests

1. Botrytis cinerea: it usually occurs in rainy season. After getting the disease, its leaves and young shoots will rot and grow a mold layer. After discovery, the damaged part shall be cut off in time, and sprayed with 50% mancozeb 800-1000 times solution

2. When the larva is caught, the stem and stem of the larva will be killed by spraying 50 times, which will cause serious damage to the stem and stem of the larva