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Organic mulch typically lasts between 4 to 6 years. However, factors like the type of organic mulch you choose, mulch size, and weather conditions can all play a role in its longevity. In some cases, you’ll need to replace organic mulch every few years.

You should add 1 to 4 inches of mulch, depending on your garden type and needs. Keep in mind that no amount of mulch can completely prevent weeds, but a heavier coverage (closer to 4 inches) can suppress weeds enough that you are only seeing them sprout every few weeks. Finer mulch prevents weeds more effectively than large mulch, so if you’re using mulched leaves or shredded bark, 1 to 2 inches will likely suffice, while 3 to 4 inches is best for larger mulch, like bark chips or straw.

Yes, weeds can still grow in decomposed granite. If properly compacted, it can act as a good weed suppressant, meaning you’ll only pull weeds occasionally. But no ground cover is completely weed-proof. To further prevent weeds, you can try spraying your decomposed granite with distilled white vinegar.

That depends on the number of cubic feet in each bag. Ten 2-cubic-foot bags of mulch will cover 20 cubic feet, while 10 3-cubic-foot bags of mulch will cover 30 cubic feet. Learning how to DIY mulch can save you money and help you repurpose natural items such as wood chips, pine needles, and leaves.