[header] How to mulch hydrangeas [title] Purchase good quality, properly processed mulch. [step] 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. [substeps] 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.