Benefits of Proper Mulching

• Helps maintain soil moisture, reduces evaporation and the need for watering
• Helps control weeds
• Serves as nature's insulating blanket, keeps soil warmer in the winter and cooler in the summer
• Can improve soil aeration, structure, and drainage over time
• Can inhibit certain plant diseases
• Helps factilitate maintenance and can reduce likelihood of damage from weed-whackers and lawn mowers
• Gives planting beds a uniform, well-cared-for look

Problems Associated with Improper Mulching

• Deep mulch can lead to excess moisture in the root zone, which can stress the plant and cause root rot.
• Piling mulch against the trunk or stems of plants can stress stem tissues and may lead to insect and disease problems.
• Some mulches, especially those containing cut grass, can affect soil pH. Continued use of certain mulches over long periods can lead to micronutrient deficiencies or toxicities.
• Mulch piled high against the trunks of young trees may create habitats for rodents that chew the bark and can girdle the trees.
• Thick blankets of fine mulch can become matted and may prevent the penetration of water and air. In addition, a thick layer of fine mulch can become like potting soil and may support weed growth.
• Anaerobic “sour” mulch may give off pungent odors, and the alcohols and organic acids that build up may be toxic to young plants.

CORRECT

INCORRECT
"Mulch Volcano"

Information and images used with permission from the International Society of Arboriculture - http://www.treesaregood.org/