Nicole Johnsey Burke argues against using mulch in raised beds because it decomposes and ties up nutrients, harbors pests like slugs and caterpillars, and wastes growing space. She recommends planting low-growing edible or ornamental plants as living groundcover instead.
Chapters
Unpopular opinion, but using mulch in your raised bed garden is a terrible idea. First, mulch is in the process of decomposing, so it's going to constantly change the PH of your soil as it breaks down and possibly take up the nutrients that your plants need. Mulch is also the best hiding place for pests. Caterpillars, slugs, snails, and other creepy things can hide and multiply while camouflaged under all that mulch. Finally, mulch waste space Every inch of your raised bed is prime real estate for growing loads of plants, and every inch filled with mulch is wasting it. Instead of mulch, plant more plants. There are tons of edible and beautiful plants that grow in the shade under your larger plants that have small root systems. These plants will cover the soil just like mulch does, but they won't be decomposing or providing a hideout for pests. Instead, they'll be producing beauty and food for you from every square inch of your garden. With this method, there's never a need for mulch because there's not a space that isn't planted. So stop using mulch and plant more plants instead. I promise you're going to love the results.