Boxwood is one of the plants that need a lot of moisture for healthy growth. The evergreen tree feels most comfortable in a fresh and nutrient-rich, but by no means wet soil. Depending on the variety, the box also reacts with little tolerance to heat and drought. Mulching - for example with bark mulch - keeps the moisture in the soil longer and thus protects against drying out.
Bark mulch protects the soil from drying out
Bark mulch retains moisture in the soil
Bark mulch has other advantages in addition to moisture protection. This will discourage weed growth unless you use the already half-rotted material from the hardware store. Instead, use high-quality, coarse bark mulch from specialist retailers. Incidentally, you can check its quality with your nose: the inferior the bark mulch, the more intense it smells - right up to very unpleasant, moldy scents. High-quality bark mulch, on the other hand, has a pleasant, woody smell.
tips
You don't have to worry about acidification of the soil from bark mulch: According to new scientific findings based on research by the Quality Association for Substrates for Plants e.V., this risk does not exist.