Improper mulching timing can lead to frost heaving, where plants are pushed out of the soil due to freeze-thaw cycles. Early mulching may also hinder plants from entering dormancy, potentially affecting their survival during winter. Wildlife such as deer and rabbits may damage unprotected woody plants, especially when food is scarce. Additionally, diseased plants left in the garden can spread pathogens, impacting next season’s growth. Gardeners should carefully follow expert advice to minimize risks and ensure plant health.