Chemicals that promote plant growth in the garden mainly include fertilizers and growth regulators. Here are some common choices: 1. **Fertilizer**: Plants need nutrients such as nitrogen, phosphorus, and potassium to grow. Choosing high-nitrogen fertilizers (such as urea and amino fertilizers) can promote leaf growth; while phosphorus-containing fertilizers (such as superphosphate) help root development; potassium fertilizers help enhance plant resistance and flowering and fruiting. 2. **Growth regulators**: - **Auxin**: Such as indoleacetic acid (IAA), which can promote cell expansion and division, helping plants grow faster. - **Cytokinin**: Such as 6-benzyladenine (BAP), which helps promote cell division and promote bud growth. - **Gibberellins**: Can promote plant growth and increase yields, especially in certain crops (such as grains). 3. **Humic acid and amino acids**: These organic substances can improve soil structure, enhance plant absorption of nutrients, and increase growth rate. Of course, you need to be cautious when using chemicals and make sure to follow label instructions and recommended dosages to avoid harming plants. In addition, proper water, sunlight, and soil quality are also important factors for healthy plant growth. Ensuring these conditions are good can further improve the growth benefits of plants.