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The ideal time to apply mulch depends on the climate and the type of plants being mulched. In general, early spring is a good time to mulch perennial gardens, trees, and shrubs before they begin actively growing. For vegetable gardens and annual flower beds, it’s best to wait until the soil has warmed up in late spring or early summer. According to the [Missouri Botanical Garden](https://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/visual-guides/mulching-guide.aspx), mulching too early in spring can delay soil warming and plant growth. In warm climates, late fall or winter can also be a good time to replenish mulch around trees and shrubs.