There are a variety of different fertilizers on the market tailored specifically for shrubs, so it's important to do your research and find the one that best suits your needs. In general, a fertilizer with a high nitrogen content is ideal for shrubs, as nitrogen is necessary for healthy growth. You'll also want to make sure that the fertilizer you choose contains micronutrients such as iron, zinc, and manganese, as these are essential nutrients for shrubs.

It depends on the type of shrub. For general shrub care, you should use a balanced fertilizer such as 10-10-10. You can also use an organic fertilizer, or a fertilizer specifically for acid-loving plants if your shrubs are acidic.