What is the harm of excessive planting density of flowers?

The harm of excessive planting density of flowers:

The main results are as follows: 1. The nutritional area of seedlings is insufficient.

2. Poor ventilation and lack of light.

3. The decrease of photosynthesis affects the growth of seedlings.

4. The seedlings are thin and weak, the number of leaves is small, and the terminal buds are not full.

5. Root growth is inhibited, root system is underdeveloped, root width is small, lateral root is less, and dry matter accumulation is less.

6. it is vulnerable to diseases and insect pests, and the seedling rate is low.