Apply 1 to 2 inches of leaf mulch on flower beds and around trees, keeping mulch away from the trunks. Mulch conserves moisture, protects plant roots, suppresses weeds, and regulates soil temperature. Make sure all trees, shrubs, perennials, and roses receive 1 inch of water per week. If Mother Nature does not provide this amount, it is best to water deeply once per week rather than water shallowly several times per week.