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How to mulch hydrangeas
Purchase good quality, properly processed mulch.
Always use a good quality mulch that has been properly processed. Mulch made from diseased or insect-infested trees can spread the disease or insects to your hydrangeas.
Therefore, mulch must be composted properly to eliminate these potential hazards. Shredded bark mulch or bark chunks sold in bags at garden centers are the safest option, but many companies that sell bulk mulch also offer a good quality product.