Mulching is an efficient technique to maintain soil fertility, regulate moisture, and suppress weeds. Organic mulches, such as wood chips, straw, or shredded leaves, break down over time and enrich the soil with essential nutrients. Spread a layer of mulch, about 5-8 cm (2-3 inches), around the base of your Bridalwreath spirea, ensuring not to cover the stem directly. This will keep the roots cool, retain soil moisture, and gradually feed the soil as the mulch decomposes.