When you are looking into the types of plants that you can use as companion plants, you might find yourself wondering whether it is a good idea to mix annuals and perennials. For clarity, annuals are plants that complete their life cycle in one growing season. They will need replanting each year. Perennials are plants that continue to live year after year. Having a garden full of established perennials makes for an incredibly easy garden to look after. However, perennials will often have seasons that aren’t as fruitful as others. When these lulls occur, it can be nice to have some annual plants to inject a splash of color and fresh life into the garden. Annuals also allow you the freedom to change up aspects of your garden year after year. Planting annuals and perennials together is absolutely fine and can result in a really pleasing aesthetic to enjoy throughout the summer. You should still make sure that the plants you are choosing are going to thrive in each other's company and be competing too much for adequate sunlight and nutrients.