Dahlias typically refer to herbaceous plants that can survive for over two years and bloom annually upon maturity. The flowers can enter a "dormancy" and then germinate, grow, bloom, and propagate seeds in the following spring. During cultivation, propagation is mainly done through division, usually during the dormant period. What are the precautions to consider when cultivating dahlias?

1. Based on ecological habits. For instance, during the early stages of Chrysanthemum, people feared internal flooding and usually planted them high. They grew holly in well-ventilated areas, chrysanthemums in poor soil quality locations, and hostas in sunny and shaded spots.

2. The layout should be in harmony with the overall scheme and design theme. When arranging various flowers, consider color to create a sense of rhythm. Avoid altering the landscape into a disordered effect.

To enhance the landscape, a diverse range of perennial grasses and flowers should be utilized in large green spaces, parks, and gardens on city streets. This requires reasonable research and arrangement in terms of blooming periods, flower colors, and plant heights.

4. The selection and development of grass flowers should feature local characteristics. For instance, silver lily, sedge, lotus root, and snow lotus, in the process of variety selection and development, we can adhere to the principle of introducing foreign species according to local conditions. In some coastal areas, we can utilize our own resources to create unique coastal landscapes.

5. Enhance variety in plant selection, prioritizing urban landscaping needs. Choices like daylilies, chrysanthemums, sedum, and peonies offer a rich palette of colors that can form a complete color system. Plant distribution should be based on the growth locations and characteristics of the flowers and herbs. Additionally, simulating and replicating natural landscapes is essential to better reflect the local characteristics of urban gardens.