What to do with grass clippings

With grass clippings. A brief context to set expectations.

With grass clippings: Quick notes

Grass clippings are a valuable resource. Whether left on the lawn, composted, or used as mulch, they provide essential nutrients, improve soil health, and reduce waste.

Grass clippings contain nitrogen, phosphorus, and potassium, which can supply up to ~25% of a lawn’s nitrogen needs. Properly managed clippings help recycle nutrients, retain soil moisture, and reduce fertilizer use.

Options for handling grass clippings from your lawn

You have several options for handling lawn clippings, depending on your lawn care goals and available space:

Leave them on the lawn

Leaving short grass clippings on the lawn allows them to decompose quickly and return nutrients to the soil. To ensure effective decomposition:

• Mow frequently so the clippings are under an inch long
• Cut no more than one-third of the grass height at a time
• Mow when the grass is dry to prevent clumping
• Use a mulching mower to break clippings into smaller pieces

Use them as mulch

Grass clippings can be used as mulch in flower beds, vegetable gardens, and strawberry patches. Spread a thin layer around plants in garden beds to retain moisture, suppress weeds, and enrich the soil. When using clippings as mulch:

• Let the clippings dry before spreading
• Apply a thin layer (1-2 inches) to avoid matting
• Do not use chemically treated clippings

Compost them

Grass clippings make excellent compost material when mixed with dry leaves, straw, or other brown materials. To compost clippings effectively:

• Mix clippings with carbon-rich materials to prevent odor
• Turn the pile regularly to speed up decomposition
• Avoid adding clippings treated with herbicides
• Do not use chemically treated clippings

Incorporate them into soil

Clippings can be worked directly into garden soil to boost organic matter. To use them effectively:

• Mix small amounts into the topsoil
• Avoid overloading any one area
• Combine with other organic materials for balance
• Do not use chemically treated clippings

Bag and remove excess clippings

If clippings are too long or clump together, and you don’t have a compost heap available at home, collect and dispose of them through a municipal yard waste program or composting facility.

Avoiding Common Issues

Common issues with lawn clippings include thatch buildup, clumping, smothering, and spread of weeds.

Thatch Buildup

Some worry that leaving clippings on the lawn causes thatch. However, properly managed clippings decompose before contributing to thatch.

To prevent buildup:

• Keep mowing blades sharp for clean cuts
• Mow at the right height to produce short clippings
• Rake or spread out thick clumps of clippings

Clumping and Smothering

Thick clumps of grass can block sunlight and airflow, leading to uneven lawn growth.

Prevent clumping by:

• Mowing frequently to keep clippings small
• Avoiding mowing when grass is wet
• Using a mower with a mulching feature

Weed Spread

Grass clippings can contain weed seeds. Seeds can come from weeds in the lawn, the surrounding landscape, or from neighboring properties.

To prevent spreading weeds:

We reference With grass clippings briefly to keep the thread coherent.

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• Mow before weeds go to seed
• Use clippings only from a well-maintained lawn
• Compost thoroughly to kill weed seeds