Things You Should Know About Wood Chip Mulch – The Ultimate Guide

Gardening enthusiasts and landscape aficionados, buckle up! We are about to delve deep into the world of wood chip mulch. No, this is not just about tossing some wood chips around your rose bushes and calling it a day.

There’s a science—and an art—to effectively using wood chip mulch in your garden. This blog post aims to equip you with valuable insights into this humble yet indispensable garden ally. So, whether you’re a seasoned horticulturist or a weekend gardener, read on. There’s something here for everyone!

The Basics

Woodchip basic

Wood chip mulch is more than just bits and pieces of wood. In the gardening world, it’s an important tool for soil management and plant health. Let’s start by understanding what wood chip mulch really is and why it’s not the same as other types of mulch.


Wood chip mulch is made from shredded tree branches, bark, and sometimes even leaves. It’s different from other types of mulch, like straw or rubber, in its nutrient composition and decomposition rate. They are generally rich in carbon and can take longer to decompose, thereby serving as a long-term soil enhancer.


There are different types of wood chip mulch, ranging from cedar and pine to oak and maple. The type of wood can significantly affect its pH level, decomposition speed, and even its natural insect-repelling properties. For instance, cedar varieties are often used in flower gardens because they are less acidic and have natural oils that repel some insects.


You might wonder why wood chip mulch gets so much attention. After all, aren’t all mulches supposed to do the same thing—protect and enrich the soil? Well, it offers a few specific benefits that can make your gardening life a whole lot easier.

Moisture Retention

  • Water Savings: Wood chips can help retain moisture in the soil, reducing the need for frequent watering.
  • Reduced Evaporation: Their insulating effect reduces water evaporation, keeping the soil moist for longer periods.

Weed Control

A thick layer of wood chip mulch can effectively prevent weeds from sprouting. It acts as a physical barrier that makes it difficult for weed seeds to reach the soil and germinate. Additionally, by blocking sunlight, it prevents the growth of already present weeds, saving you time and effort in the garden.

Common Misconceptions

misconceptions WOOD CHIPS

As with any popular garden product, wood chip mulch is subject to myths and misconceptions. Let’s take a moment to debunk some of the most common misunderstandings surrounding this type of mulch.

It Makes Soil Acidic

One of the most prevalent myths is that wood chip mulch will acidify your soil. While it’s true that some types of wood are acidic, the mulch generally has a negligible impact on soil pH. It’s more important to consider the original pH of your soil and the plants you are growing.

It Attracts Termites

Another common misconception is that wood chip mulch will bring termites into your garden. Research has shown that while termites do eat wood, they generally prefer rotting wood and are not particularly attracted to wood chips. In fact, because wood chips can deter some types of pests, they may even serve a protective role.

Choosing the Right Wood Chip Mulch

Choosing the right Mulch

Choosing the right type for your garden can be a game-changer. Each type has its unique properties, and what works for one garden might not work for another. Here’s how to make an informed choice.

Consider Your Plants

The type of plants you have can dictate the type of wood chip mulch you should use. Acid-loving plants like rhododendrons and blueberries may benefit from a pine-based mulch, while plants that prefer a more neutral pH might do well with hardwood mulches like oak.

Organic vs Non-Organic

If you can, always opt for organic wood chip mulch. Non-organic mulch might contain harmful chemicals or pesticides that can affect plant health. Organic mulch will also decompose over time, adding valuable nutrients back into the soil.

How to Apply

Use Wood Chip Mulch

You’ve bought your bags of wood chip mulch and are ready to get to work. But wait, there’s a technique to applying it effectively. Here’s a quick guide on how to get the best results.

Preparing the Ground

Before you start, remove any existing weeds and water the soil thoroughly. Lay down a layer of newspaper or cardboard if you want extra weed control. This biodegradable barrier will break down over time but will keep weeds at bay while your mulch settles in.

Application Technique

Apply a 3-4 inch layer of wood chip mulch around plants and over the soil, being careful not to let the mulch touch the base of your plants. Too much mulch against the plant stems can lead to rot and other diseases. Extend the mulch layer to the drip line of the plants to ensure adequate moisture retention and weed suppression.

When to Replace

replace WOOD CHIP

One of the best things about wood chip mulch is its longevity. However, it doesn’t last forever. Let’s look at when and how you should go about replacing it.

Decomposition Rate

On average, wood chip mulch will need to be replaced every two to four years. The actual rate of decomposition will depend on the type of wood, local weather conditions, and the presence of decomposing organisms in your soil.

Signs It’s Time to Replace

When the color of the wood chips fades significantly or the layer becomes too thin, it’s time to consider re-mulching. Other signs may include decreased water retention and an increase in weed growth. These indicators suggest that the mulch is no longer performing its functions effectively.

Tips and Tricks


To wrap things up, here are some nuggets of wisdom that can help you make the most out of your wood chip mulching experience.

Depth Matters

Be mindful of the depth when applying wood chip mulch. Too little and it won’t suppress weeds or retain moisture effectively; too much and you risk creating conditions that invite pests and diseases.

Mixing is Good

Don’t be afraid to mix different types of wood chip mulch. Each type has its own set of nutrients and properties. Mixing them can provide a more balanced nutrient profile for your soil.

Don’t Forget to Compost

If you have the space, consider composting your old wood chip mulch. As it decomposes, it will turn into rich, organic matter that can be used to further enrich your garden soil.

Advanced Uses

Companion Planting

So you think you know all there is to know about wood chip mulch? Well, hold on to your gardening gloves because we’re diving into some advanced uses that even seasoned gardeners might find intriguing.

Permaculture Practices

In permaculture design, wood chip mulch is used not just as a soil conditioner but as a part of sustainable, closed-loop systems. In these systems, wood chip mulch can serve multiple purposes, such as water filtration in constructed wetlands or as the organic layer in hugelkultur beds, a type of raised bed that mimics the natural decay of a fallen tree.

Companion Planting

Some gardeners take wood chip mulching to the next level by combining it with companion planting techniques. For example, using cedar wood chips around plants that are susceptible to certain types of fungal infections can offer an additional layer of protection due to cedar’s natural antifungal properties.

Environmental Impact


In today’s eco-conscious world, it’s vital to consider the environmental footprint of our gardening practices. So, let’s explore the environmental pros and cons of using wood chip mulch.


Wood chips are often produced from tree trimmings, wood waste, or sustainable forestry practices. They can be a very eco-friendly choice if sourced responsibly. Always check if the wood chips you’re buying are from a sustainable source, preferably one that’s certified by a recognized environmental organization.

Carbon Sequestration

A less-known but significant advantage of using wood chip mulch is its ability to sequester carbon. Wood chips are high in carbon and can lock it into the soil for extended periods, thereby contributing to efforts to mitigate climate change.


For the DIY enthusiasts out there, making your wood chip mulch can be a rewarding experience. Not only will it save you money, but it also provides a way to recycle garden waste.

What You’ll Need

  • A wood chipper or shredder
  • Tree branches, bark, and leaves
  • Safety gear such as gloves and eye protection

Steps to Make Your Own

  1. Collect Raw Materials: Gather branches, bark, and leaves that you can run through a wood chipper. Avoid using diseased wood or wood treated with chemicals.
  2. Chip the Wood: Feed the materials into the chipper, following the manufacturer’s safety guidelines.
  3. Curing: Allow the freshly chipped wood to sit in a pile for a few weeks. This step helps to start the decomposition process, making the chips more effective when used as mulch.


Can wood chip mulch be used for indoor plants?

It is generally not recommended for indoor plants. Its primary functions, such as moisture retention and weed suppression, are more suited for outdoor settings. Additionally, the decomposing wood chips could encourage mold growth indoors where there is less natural airflow and sunlight.

Do I need to add fertilizer when using wood chip mulch?

It’s not strictly necessary to add fertilizer when using it, but it could be beneficial. Wood chips can tie up some of the nitrogen in the soil as they decompose. Adding a nitrogen-rich fertilizer can help counteract this and provide essential nutrients to your plants.

Are there any plants that don’t work well with wood chip mulch?

Plants that prefer extremely well-draining soils, such as succulents and some herbs like rosemary and lavender, may not be the best candidates for wood chip mulch. The moisture retention qualities of the mulch can lead to waterlogged conditions that these plants do not tolerate well.

Can I use wood chip mulch in a playground or recreational area?

Yes, it is often used in playgrounds and other recreational areas. It provides a soft, cushioned surface that can help prevent injuries from falls. However, make sure to choose wood chips that are free from chemicals and splinters for these settings.

How can I prevent mold or fungi from growing in my wood chip mulch?

To prevent mold or fungi, it’s essential to avoid overwatering the mulched areas. Good drainage is crucial. Also, consider using wood chips that are relatively fresh and free from disease.

Turning over the mulch occasionally can also help air it out, reducing the likelihood of mold or fungi development.

Can wood chip mulch catch fire?

While it is not highly flammable, it can catch fire under certain conditions, especially in hot, dry climates. To minimize the risk, avoid placing it too close to fire-prone areas like barbecue grills or fire pits. Keep the mulch moist, particularly during dry spells, to reduce the chances of combustion.

Final Words

There we have it—your ultimate guide to wood chip mulch. From its types and benefits to advanced usage and DIY options, we’ve covered it all. Whether you’re a beginner or a seasoned green thumb, understanding the multifaceted world of wood chip mulch can only enhance your gardening game.