If you've spent any time around gardens, you've probably heard people talk about mulch, but you might not be entirely sure what it is or why it matters so much. At its simplest, mulch is a protective layer of material spread over the surface of soil. That simple layer does a surprising amount of work, protecting your plants, conserving moisture, and keeping your garden healthier with less effort on your part.
Whether you're tending flower beds, vegetable gardens, or the soil around trees and shrubs, understanding mulch is one of the easiest ways to improve your garden's health and appearance.
What Mulch Actually Does
Mulch isn't just decorative, though it certainly makes garden beds look tidy and finished. Its real value is in the practical benefits it delivers to your soil and plants.
- Conserves moisture: A layer of mulch slows evaporation, keeping soil moist longer so you water less often, especially valuable during hot Ontario summers.
- Suppresses weeds: By blocking sunlight, mulch prevents many weed seeds from germinating, dramatically reducing the time you spend weeding.
- Regulates soil temperature: Mulch insulates soil, keeping it cooler in summer and protecting roots from temperature swings.
- Prevents erosion: It shields soil from heavy rain and wind that would otherwise wash or blow it away.
- Improves soil over time: Organic mulches break down gradually, adding nutrients and improving soil structure as they decompose.
Types of Mulch
Mulches fall into two broad categories, each with its own uses.
Organic Mulch
Organic mulches come from natural materials and break down over time, feeding the soil as they do.
- Shredded bark and wood chips: Long-lasting and attractive, ideal around trees, shrubs, and garden beds.
- Compost: Rich in nutrients, great for vegetable gardens and improving soil.
- Leaves and grass clippings: Inexpensive and effective, though they break down faster.
Inorganic Mulch
Inorganic mulches don't decompose and are used where longevity or a specific look is the goal.
- Gravel and river rock: Permanent, low-maintenance, and excellent for drainage areas and modern landscapes.
- Landscape fabric: Often used under stone to suppress weeds while allowing water through.
How to Use Mulch in Your Garden
Applying mulch correctly makes all the difference. A few simple guidelines:
- Apply the right depth: Aim for about 5–8 cm (2–3 inches). Too thin and it won't suppress weeds; too thick and it can suffocate roots.
- Keep it away from stems and trunks: Piling mulch against plant stems or tree trunks traps moisture and invites rot and pests. Leave a small gap around the base.
- Refresh organic mulch: Because it breaks down, top up organic mulch once a year to maintain its benefits and appearance.
- Weed first: Clear existing weeds before mulching so you're not trapping them underneath.
Choosing the Right Mulch for Your Space
The best mulch depends on what you're trying to achieve. For garden beds where you want to enrich the soil, organic mulches like bark or compost are ideal. For pathways, drainage areas, or low-maintenance landscapes, gravel or river rock may be the better choice.
The team at Michael Durham Landscaping can help you choose and install the right mulch for your garden's needs. Contact us for more information about landscaping services today.