Mulch Calculator

Mulch Depth Recommendations

The depth of a mulch application varies based on the purpose:

• New Beds: Apply 3-4 inches to suppress weeds and retain moisture.
• Existing Beds: Apply 1-2 inches to refresh appearance and functionality.
• Around Trees and Shrubs: Maintain a 2-3 inch layer, keeping mulch away from trunks to prevent rot.

Over-mulching can lead to waterlogged soil and root rot, while under-mulching may not effectively suppress weeds or retain moisture.

Types of Mulch

Organic Mulches

• Wood Chips/Bark: Long-lasting, suitable for trees and shrubs.
• Straw: Ideal for vegetable gardens; decomposes quickly.
• Compost: Enriches soil; best for flower beds and vegetable gardens.
• Grass Clippings/Leaves: Cost-effective; may require composting before use.

Inorganic Mulches

• Gravel/Rocks: Durable; suitable for pathways and areas requiring good drainage.
• Rubber Mulch: Long-lasting; often used in playgrounds.
• Landscape Fabric: Weed control; often used under other mulches.

Benefits of Mulching

Conserves Soil Moisture

Mulch acts as a protective barrier that slows water evaporation from the soil. This can reduce watering needs and time.

Suppresses Weeds

A layer of mulch can prevent sunlight from reaching weeds resulting in reduced germination and growth.

Regulates Soil Temperature

Mulch insulates soil, keeping it cooler in the summer and warmer in winter. This protects plant roots from extreme temperatures.

Prevents Soil Erosion

Mulch absorbs the impact of rain and irrigation, preventing soil erosion and reducing water runoff.

Adds Nutrients (Organic Mulch)

When organic mulch decomposes, they add nutrients and organic matter to the soil, improving its structure and fertility.

Aesthetic Appeal

Mulch gives landscaping projects a neat, finished appearance and can complement your design with color and texture.

Mulching Best Practices
& Common Mistakes to Avoid

Best Practices

1. Remove weeds and debris
2. Water area thoroughly
3. Consider adding a layer of weed blocker fabric, newspaper or cardboard underneath for extra weed suppression

1. Apply mulch evenly across the area
2. Keep mulch away from plant stems and tree trunks
3. For slopes, use a coarser mulch that won't wash away easily

Seasonal Application

• Spring: Apply after soil has warmed to prevent delaying plant growth
• Summer: Add mulch to help soil retain moisture during hot months
• Fall: Apply before winter to insulate plant roots from freezing temperatures
• Maintenance: Replenish annually as mulch breaks down into soil

Common Mistakes

• "Volcano mulching" around trees (piling mulch against trunks)
• Applying mulch too thinly
• Using fresh wood chips on vegetable gardens
• Using plastic under mulch which prevents water penetration