So, should you remove old mulch? Expert green thumbs contend that getting rid of last year's mulch is completely unnecessary. Mulch gradually breaks down, adding beneficial nutrients and other organic matter to the soil. Removing pre-existing mulch every year only ends up to be extra work and a needless expense.

Do you have to remove mulch every year?

Mulch should be replenished or replaced as you start to see signs of decomposition, soil erosion and discoloration. And you'll mostly likely need to remove and replace all mulch after 5-6 years.

Can you put new mulch over old mulch?

Both types of mulch break down over time and improve your soil for structure, nutrient availability, and water infiltration. With these types of mulch, you can simply add the new mulch over the old mulch and judge the new amount to add by the thickness of the existing mulch.