Mulch is more than just a finishing touch for garden beds. When used correctly, it helps trees and plants grow stronger, stay hydrated, and stand up to stress, especially during hot, dry weather. But not all mulch is created equal, and how you apply it matters more than you might think.
What is Mulch, Really?
Mulch is a layer of material spread over the soil around the base of trees, shrubs, and plants. In nature, dead leaves and organic debris naturally break down and enrich the soil. Mulch works in a similar way, helping the soil retain moisture, block weeds, regulate temperature, and add nutrients over time.
There are two main categories of mulch: organic and synthetic.
Organic mulches are made from plant material and include:
- Shredded leaves
- Straw
- Pine needles
- Chipped or shredded bark
- Wood chips
These materials break down slowly and actually feed the soil as they decompose. That’s a win for your plants.
Synthetic mulches include:
- Stone or gravel
- Landscape fabric
- Black plastic
While these may look tidy, they don’t provide any nutrients. In fact, they can raise the temperature of the soil, which can stress out roots—especially in summer. We don’t recommend using them around trees or landscape plants.
Why Mulch Matters
Mulching is one of the simplest things homeowners can do to protect their landscape. It’s especially helpful in the warmer months, when plants lose moisture quickly and roots are exposed to heat. A well-mulched area will stay cooler, hold moisture longer, and support healthier root systems.
Other benefits include:
- Improved soil structure and airflow
- Reduced weed growth
- Less frequent watering
- Protection from lawnmower and trimmer damage
Considering how inexpensive it is, mulch gives you a big return on effort.
Tips for Proper Mulching
To make the most of your mulch, here are a few best practices we recommend:
- Keep the layer between 2 and 4 inches thick
- Spread it wide—as much of the root zone as possible
- Keep it away from the trunk or base of plants
- Loosen the soil a bit before adding mulch so it can interact with the ground
- If you’re reapplying mulch, break up the old layer first
- Water after mulching if conditions are dry
And skip the “mulch volcano.” Piling mulch up against the trunk traps moisture where it doesn’t belong and can lead to decay or pest problems. Keep a small, clear space around the base of the tree instead.
Need Help With Your Landscape?
If you’re not sure what kind of mulch to use or how to apply it properly, our team at Aspen Tree and Turf is here to help. We can assess your property, make mulch recommendations, and set your trees and plants up for a healthier season ahead.