Please choose the correct ending to complete the given sentence: Home and Garden: [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.

Ending1: [substeps] Mulch should not contain chemicals that can be harmful to your hydrangeas. [title] Fertilize your potted plants with oxygen-rich mulch. Ending2: [substeps] Mulch with high fructose corn starch content should also be avoided. Mulch with less fructose will deter weeds from growing. Ending3: 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. Ending4: Mulch has been used in science to help fight insect pests, non-invasive insects, such as blackflies and termites, for centuries. If your trees do not have proper mulch, they can quickly succumb to pests that collect in the crevices of their trunks.

Answer format: ending1/ending2/ending3/ending4