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Maple Tree Leaves #776974

Asked November 02, 2021, 7:12 AM EDT

A. Is it a good idea to use maple tree leaves in the garden compost pile and/or use them for mulch? B. My raised bed gardens are wormfree, not a good thing. The soil is all organic with organic amendments. I plan to purchase worms next spring. Any suggestions regarding what worm quantity per ft2 and species to buy?. We are in Hardiness Zone 5b. C. Does the MSU soil test include a test for calcium levels? D. If calcium needs to be added to the garden soil , what is the recommended way to o that?

Marquette County Michigan

Expert Response

Doug, thanks for the question.

Maple leaves are fine for compost and mulch. Whole maple leaves can mat preventing water from infiltrating the soil.  Shredded leaves will break down faster and avoid this problem.

If you are not finding earthworms in your garden there may be a good reason you may not be seeing them.  If you create an inviting habitat they should come and multiply; however, they won't be as active or productive as a composting type like the red wigglers. There can be a problem with overwintering red wiggles if the soil temp falls below freezing. Earthworms can also cause ecological damage.  Most sources suggest about five to ten earthworms per square foot.  Check out the following links:

The home soil test from MSU covers the following:

  • Soil texture
  • pH value
  • Nutrient levels for phosphorus (P), potassium (K), calcium (Ca) and magnesium (Mg)
  • Soil organic matter (OM) percentage
  • Personalized recommendations for fertilizer and any needed pH modifications

See the following link:

Calcium recommendations will be part of the soil test.  Apply at the rate specified and work it into soil ~six inches. Fall is a good time to apply.

I hope this helps.

An Ask Extension Expert Replied November 03, 2021, 7:22 PM EDT

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