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All about mulch: Too much of a good thing is bad for your trees, shrubs and palnts
particularly when using organic mulches such as shredded hardwood. If adding new mulch to existing mulch will exceed a total of 4 inches, remove some of the older mulch and add it to a compost ...
16 Types of Mulch for Landscaping and Gardening
Shredded hardwood mulch works best around trees, shrubs, and in perennial beds and decomposes more slowly than softwoods.