When considering the task of applying a fresh layer of mulch to an existing garden bed, one might ponder: should I remove the old mulch before adding new mulch? This seemingly straightforward decision can have profound implications for the health and aesthetic appeal of your landscape. Is it beneficial to retain old mulch, as it may decompose and enrich the soil, or is that layer more detrimental than advantageous? Could the compaction of decaying mulch impede moisture penetration and hinder vital air circulation to the plant roots beneath? On the other hand, is there a risk of harboring pests or diseases if the old mulch is left undisturbed? Are there specific conditions or types of plants that necessitate a different approach? With these questions in mind, how do you ascertain the most prudent course of action to ensure the vitality of your garden while maintaining its visual allure?