How to Terminate Cover Crops

The final step in putting your cover crop to work.

Growing a cover crop is only part of the process. Termination is how you end its growth and begin returning the plant material and nutrients it contains to the soil. Depending on the cover crop, your garden, and what you plan to grow next, you may cut or mow it and leave the residue as mulch, or incorporate it into the soil. The goal is not simply to get rid of the cover crop. It's to keep as much of what you grew working in your garden as possible.

When Should I Terminate My Cover Crop?

There isn't one perfect day to terminate a cover crop. Use these five considerations to decide what's best for you garden.

1. YOUR GOAL

What do you want the cover crop to do for your soil and garden? (e.g., add nitrogen, build organic matter, protect soil, suppress weeds)

Your goal helps determine how much growth you need.

2. NEXT CROP

What are you planting and when? This helps determine how much time your have.

More time = more flexibility. Less time = earlier termination

3. GROWTH

How much growth do you have? More growth means more roots and biomass, but you don't need to wait for maximum growth.

Enough is enough. You don't need maximum growth to get the benefits.

4. FLOWERING/SEED

Is it flowering? Is it starting to set seed? Terminate before mature seed develops if you don't want volunteers in the future.

Flowering can help signal maturity, but the best timing depends on the cover crop and your goal.

5. TERMINATION METHOD

How will you handle the cover crop material? Cutting & leaving, composting, incorporating, or for winter-killed cover crops, letting frost do the work.

Your method influences how early of late it's best to terminate.

🌱 WATCH THE PLANT, CONSIDER WHAT YOU'RE GROWING NEXT, AND TERMINATE BEFORE IT BECOMES SOMETHING YOU DON'T WANT TO MANAGE. 🌱

Let Your Goal Guide the Finish

Your goal helps determIne how much growth to allow, when to terminate and what to do with the plant material. There isn't one perfect approach for every garden.

BUILD NITROGEN

If your cover crop contains legumes such as clover of vetch, allow plenty of leafy growth but terminate around the bud to early-flowering stage.

PRIORITIZE:

Cut and incorporate when you want nutrients to become available more quickly. Allow time for decomposition before planting.

BUILD ORGANIC MATTER

More growth produces more roots and plant material. Let the cover crop develop, but terminate before it becomes woody or sets mature seed.

PRIORITIZE:

Cut and leave to keep the soil covered and return the plant material gradually.

PROTECT THE SOIL

Keep the cover crop growing until you need the bed, provided it is not beginning to set seed.

PRIORITIZE:

Cut and leave, or leave winter-killed residue in place as surface protection

SUPPRESS WEEDS

Allow the cover crop to form dense growth, then terminate gefore mature seed develops.

PRIORITIZE:

Cut and leave the residue as a surface mulch. Move it aside only where you need to plant.

🌱 YOUR GOAL SETS THE PRIORITY - BUT YOUR NEXT CROP DETERMINES THE DEADLINE 🌱

How Do I Terminate It?

Choose the method that fits your goals, your cover crop, and what you're planting next.

BEST WHEN PRACTICAL

1. CUT & LEAVE

Cut the cover crop and leave the plant material on the soil as mulch.

BEST FOR:
  • Building organic matter
  • Protecting soil
  • Suppressing weeds
  • Low-disturbance gardening

HOW TO:

Mow or cut close to the soil. Leave the residue in place. Plant through the mulch or move it aside as needed.

2. CUT & INCORPORATE

Cut or chop the cover crop, then lightly mix the material into the upper few inches of soil.

BEST FOR:

  • When you want residue mixed into the soil
  • Preparing beds for planting
  • When you have time for decomposition

HOW TO:

Cut or chop the plants. Lightly mix the material into the top 2-4 inches using a garden fork, broadfork, or tiller. Water and allow it to begin decomposing before planting.

3. CUT & COMPOST

Cut the cover crop and move the tops to the compost pile or another garden area. Leave the roots in place when practical.

BEST FOR:

  • When you need a cleaner seedbed
  • When there is too much residue to manage in the bed
  • When the material can be used elsewhere

HOW TO:

Cut the plants. Remove the tops and add them to your compost pile or use them in another garden area.

CAN WINTER DO THE WORK?

Sometimes - but it depends on the cover crop and your winter conditions.

Sustained freezing temperatures may naturally terminate cold-sensitive cover crops. If the crop is winter-willed, leave the residue in place to protect the soil until you're ready to plant.

COLD-SENSITIVE CROP

SUSTAINED FREEZING

TOP GROWTH DIES

CHECK AGAIN IN SPRING

Winter-kill is not guaranteed - even within a cover crop mix.

  • If the crop is brown and no longer growing, leave the residue in place.
  • If it remains green or begins growing again, terminate it using one of the methods above.

🌱 OUR RECOMMENDED METHODS HELP PROTECT THE SOIL, SUPPORT SOIL LIFE AND RETURN CAPTURED NUTRIENTS AND ORGANIC MATTER TO THE GARDEN. 🌱

What Happens After Termination?

Termination ends the cover crop's growth, but its roots and residue continue working in your garden.

1. LEAVE THE ROOTS

Roots left in place continue protecting soil structure as they decompose.

2. PLAN FOR THE RESIDUE

Plant transplants through surface mulch or move it aside as needed. Clear a small seedbed when directly sowing seeds.

3. GIVE INCORPORATED MATERIAL TIME

If you mix the cover crop into the soil, allow at least two to four weeks before planting. Large, mature growth or cool soil may require more time.

🌱 WATCH FOR REGROWTH. IF THE COVER CROP BEGINS GROWING AGAIN, CUT IT BACK BEFORE IT COMPETES WITH YOUR NEXT CROP. 🌱

One Season Feeds the Next

Termination isn't the end of your cover crop's work. As the roots and residue break down, they continue protecting the soil and preparing the garden for what come next.

 Plan Your Next Cover Crop Back to Cover Crops 101