Falling leaves, decaying branches, and tree trunks improve the soil. If you plan to add flowering annuals, add a slow-release fertilizer to your beds in the spring to help produce larger, more colorful flowers. Add compost or other organic matter to a garden located near tall buildings once a year. Mulching your garden conserves soil moisture and smothers weeds. For low- maintenance mulch, try adding a ground cover.
Ground covers leave little room for unwanted plants.
Pachysandra, ivy and periwinkle are two popular choices. Hostas shade out weeds that try to grow beneath them and serve as living mulches. Mulching a garden well lessens the need for watering. In the hottest part of summer, you may want to water your garden well at least once a week. Water in the morning so moisture evaporates more slowly.