Leaf Mulch Vs. Wood Mulch: The Difference and Why It Matters!


I always enjoy spending time in my garden, but sometimes I have a tough choice to make, such as what kind of mulch should I use in my garden beds? There are wood chips, leaf mulch, and even pine needles as options, so I decided to investigate my options and their differences on the internet.

Leaf mulch and wood mulch are two different kinds of mulches that have slightly different uses and properties. While wood mulch takes longer to break down, leaf mulch often needs to be replaced regularly as it breaks down into organic matter.

Mulching is one of the most important steps you take with your garden, and making the right choice can save you time — and money! Read on to know more about the benefits and comparisons between both.

Reasons Why Mulching Is Important No Matter What You Choose

When you have amended your soil to make it healthier for your vegetable plants or flowers to grow,  you also make it easier for weeds to grow. You’ve cleared out some prime real estate, and seeds blown across the ground can easily take root.

In addition, the very act of digging or tilling can unearth weed seeds that were buried and dormant within your soil. What’s a gardener to do? Mulch!

By covering your soil with a layer of mulch, you cut down on the opportunities weeds have to grow.

A layer of mulch spread evenly over the garden and around your plants helps prevent weeds from getting the sunlight they need to grow.

Mulching and it’s benefits

Mulching also helps with the temperature regulation of the soil. During the warmer months of spring and summer, it helps keep your plants’ roots cool.

Conversely, during the cooler months, it helps minimize fluctuations in ground temperature and keeps the soil warmer, making it ripe for spring planting and helping to protect your overwintering plants.

When you mulch, you’re also helping lock in a layer of moisture. When you water your plants, ideally with drip irrigation, the mulch around them helps keep the water from evaporating right away, especially in the heat of summer.

That’s incredibly important, especially for plants that crave plenty of water, such as tomatoes.

Wood Mulch

Wood mulch tends to be the most common type of mulch around. You’ll find several varieties, including wood chips and shredded bark.

Wood chip mulch tends to be made from shredded or cut-up limbs, bark, and trees.

Shredded bark can be a hassle to deal with because it tends to be filled with splinters that stick into your gloves and clothing, but it can be quite useful on a steep slope, where nothing else compares as a material that won’t slip.

Wood mulch and it’s benefits

Wood mulch is a reliable mulching product. Many people also enjoy the aesthetic of wood mulch: you can find it in colors such as black, brown, and red, and it looks rather neat when spread evenly across the bed.

It is also highly effective at keeping weeds down and helping your soil retain its moisture.

Wood mulch rakes easily

As you maintain your garden beds, you’ll also note that wood chip mulch rakes quite easily, so you can move it out of the way while you’re planting or tilling. Once you place your wood mulch down, you don’t need to worry about replacing it straight away, so you can kick back and relax, enjoying your beautiful garden more.

Wood much also have the ability to repel insects

Using wooden mulch may help repel insects from your plants. The smell of the mulch may be enough to ward off creepy crawlies from making a meal of your prized cucumbers.

Some mulch from specific bark keep weeds at bay

You can find different types of shredded bark mulch, but some people swear by eucalyptus bark.

Wood mulch from eucalyptus bark has weed retardant properties because of its growth-inhibiting characteristics.

This can also work against your plants, so you shouldn’t use it if you plan to have lots of plants in an area or need them to grow significantly.

Wood mulch disadvantages

It’s also important to keep in mind that, while wood mulch has many advantages, it does have some disadvantages as well.

Limit your tilling on wood mulch

Unlike leaf mulch, which can be readily tilled into your soil, you don’t want to constantly till hardwood mulch into your soil. If you do, it can pull nitrogen that your plants need to go into the ground away from the plants as the mulch decomposes.

pH of the soil may change depending on the type of wood mulch

The type of wood mulch you use will impact your garden and be considered carefully. Mulch from hardwood trees such as hickory and oak lasts significantly longer than mulch from softwood trees.

Unfortunately, that convenience comes with a price. Your hardwood mulch tends to be more alkaline, and as it decomposes, it will make the pH of your soil more alkaline, which can affect acid-loving plants.

Wood mulch may crush smaller plants

Wood mulch is also heavier than leaf mulch.

While it takes more wind to blow wood mulch around in comparison to leaf mulch, it could be blown and cover over your plants, potentially even crushing smaller plants.

You’ll also want to make sure you don’t spread the layer of mulch too thick, as your growing plants aren’t likely to be able to push it out of the way.

Leaf Mulch

Leaf mulch tends to come in two major forms:

  • They can come from the leaves of deciduous trees
  • or they can come from evergreen pine needles.

Both of these make an excellent ground cover to reduce weed growth.

Benefits to leaf mulch

Because leaf mulch from deciduous leaves also tends to decompose readily, it is great for adding organic material to your soil. Many people compost their leaves as helpful amendments to the garden each year. Keep in mind that insects and snails really like living and hanging out in leaf mulch, so you want to make sure you keep the mulch from directly abutting your plants.

Leaf mulch is great for temperature regulation in winters

In addition, leaf mulch may be superior to wood mulch as a ground cover during winter months to help regulate the temperature of the ground.

Leaf mulch is great for retaining moisture

Leaf mulches will also do a great job at helping retain moisture in your gardens. They tend to be more effective than even wooden mulches, so if you have a hot climate and don’t want to water all of the time, consider leaf mulches to give you a helping hand.

Leaf mulch attracts good worms and insects

Insects and worms love leaf mulch. The detritus particularly attracts worms, which you want to encourage in your garden. As the leaves break down, they provide the worms with nutrition, which aerate the soil and provide worm castings beneficial to your plants.

Leaf mulch is great for vegetable gardens and for annual plants

Consider, however, that it may be easier to use leaf mulch in vegetable gardens or gardens with annuals that you intend to replant each year. You can till the leaf mulch right into the ground from the previous year. In contrast, you’ll need to rake away the wood mulch and then reapply it.

Some disadvantages to leaf mulch

When you use leaf mulch, you also need to be prepared because it can easily be blown away. Shredding the leaf mulch actually helps keep it on top of your soil, but it will cause the leaves to break down more readily.

Leaf mulch lasts shorter than wood mulch

Leaf mulch may not be as attractive as wood mulch: after all, it looks like leaves have just been spread across your garden. Consider shredding the leaves before you use them to help them decompose more readily.

This does also feature a downside: wood mulch will last much longer than your leaf mulch.

Wooden mulch may last several years, while leaf mulch might not last a complete year.

Leaf mulch is densely packed, which for keeping weeds out, but not so much for plant’s sprouting

Leaf mulch tends to become densely packed when you spread a layer across the ground, whereas wood mulch tends to let in more air and sunlight. This is, however, great for keeping weeds at bay since the leaf mulch covering the sunlight from the soil surface will give weeds a hard time from sprouting and growing. This article covered more of that article that I wrote about leaf mulch against weeds, linked through here.

Keep this in mind if your plants aren’t sprouting or growing quite as nicely as you had hoped.

Leaf mulch from pine needles have less desirable qualities

Pine needles are a less ideal version of leaf mulch. They tend to form an impenetrable layer, which many plants don’t appreciate — although it really helps keep the weeds at bay.

Pine needles also tend to be acidifying. They should not be applied around many of your plants; instead, keep them to areas such as around your blueberry bushes or azaleas.

Other Kinds of Mulch

There are also synthetic mulches and other options such as rocks or pebbles. These can be quite beautiful as additions to your garden, and they will often last for years.

There are so many different mulches that can be utilized in the garden. And I cover these in great detail in the video below, so that you will know which is the best for your particular situation.

Unfortunately, synthetic mulches tend to be much more expensive than wood mulch or leaf mulch, and they may be more labor-intensive.

After all, moving a bag of mulch is often easier than moving a bag of rocks!

Grass clippings is a rather good option for mulch

Grass clippings are an excellent — and free — source of mulch. While it’s always best to recycle some of your grass clippings back into your yard to promote healthy lawn growth, you can also spread a layer in your vegetable garden to add some nitrogen to the soil.

You can use your composting for mulching

Compost is another option for mulching; Compost can come from organic matter that you have in excess in your homes, may it be from plants, food wastes, discarded lawn clippings, and many more. They can be used for fertilizer to your plants, flower beds and enrich your soil. Its many benefits and process are covered in this article that I wrote on composting on beginners, linked through here.

But with adding compost as mulch, you might want to add them sparingly. As compost dries out, it tends to become less biologically active, losing its properties as compost.

Instead of just applying compost on its own, why not add a thin layer of compost and then cover it in leaf mulch?

You may also choose stray or hay as inexpensive mulching choices

Straw or hay is another fine and inexpensive choice for mulching. You want to make sure the hay is seed-free, or you’ll just be adding to your weed problem.

Like with other mulches, don’t pile the straw or hay up against your plants, or you will just be encouraging damage from slugs, snails, insects, and even rodents.

Choosing a Mulch

When you go about picking a mulch, it’s important to realize that there are two main classifications for your mulch: inorganic and organic mulch.

  • Inorganic mulch includes black plastic and landscape fabric (yes, those are mulch!), as well as shredded rubber.
  • Organic mulches originate from anything that used to be alive, so wood chips, compost, shredded leaves, and even sheets of newspaper.

Organic mulches decompose, which can improve and enrich the soil as they degrade — even newspaper! They vary in how long they take to break down and how some of their properties, such as pH.

The plants we’ve chosen will collect and cycle Earth’s minerals, water, and air; shade the soil and renew it with leafy mulch; and yield fruits and greens for people and wildlife.

Toby Hemenway

In contrast, inorganic mulches don’t really decompose or break down appreciably, at least in the short term. They do have their advantages, though: while both types of mulches help keep weeds from cropping up, black plastic mulch can warm the soil much more effectively and radiate heat to keep vegetables that like it hot — things like tomatoes or eggplants — much happier.

Considerations When Mulching

When you mulch, it’s important to consider how you are mulching.

Weed out your garden before mulching

First, you want to make sure that the area you are mulching has already been thoroughly weeded. Tossing some shredded leaves or wood chips over the top of weeds that have already taken root is not likely to help you very effectively.

Mulching depth to keep weeds at bay

You also want to make sure that you lay down a thick enough layer to help keep weeds from growing through it, no matter what type of mulch you’re using. At the same time, you don’t want the layer of mulch to be too thick, or you can cause your tree or shrub roots to grow up into the mulch or choke down your vegetable plants that are trying to grow.

Typically, a 3 to 4-inch layer of mulch is effective at preventing weed growth.

While some people cite using as much as 6 inches of mulch, you can often get away with as little as 2 inches, saving you time and money, particularly in shady locations.

Look into double mulching against weeds

If the vegetable bed or garden bed you’re using is filled with potential weed seeds, you might consider a two-pronged approach or a double-mulching technique. After you’ve prepared your garden beds appropriately and mixed in any amendments such as compost, plant your plants.

After you’ve watered them well, put down layers of wet newspaper (it’s okay to wet the newspaper after you’ve put it down but wetting it down first will help keep it from blowing away).

This will break down over the next few weeks but will suppress weed growth effectively. Then layer mulch such as wood chips over the top of it for an aesthetically pleasing look.

‘Mulch volcanoes’ weaken plants

You don’t want to make a so-called “mulch volcano” around your plants, such as your trees. While this has become a trend, it’s not helpful to your plants, and it can even weaken them.

When you pile mulch of any variety right up against the woody stems of your trees and shrubbery, it can cause the outer layer of the plant to weaken and rot.

Water and nutrient transport throughout the tree’s tissue is hampered. In addition, it can encourage rodents and insects to nest around your plants.

Mulching for trees

The easy way to remember how to mulch around trees is the method of “three-three-three.” That means you make a circle of mulch around your tree three inches from the trunk, three inches deep, and roughly three feet in diameter.

Rather than piling the mulch at the base of the plants where it can do damage, make a rain-catching dish around the roots with your tree in the center.

Mulching and how it may affect pets

Mulching too thickly can also build up elements that, over time can become toxic to your pet.

Certain hardwood mulches may cause manganese to accumulate in the soil around your tree, eventually stunting its growth.

Mulching for flowers and vegetables

Because mulch retains moisture, it can also affect the stems of flowers and vegetables.

If you put mulch right up against the plants’ bases, they can easily rot as the mulch doesn’t allow water to evaporate, even if you’re using a garden-friendly watering method such as drip irrigation.

Mulching during springtime

Mulches that hold in more moisture also tend to slow how quickly your soil warms during the spring.

This tendency to regulate the soil’s temperature is helpful when you’ve got plants you want to keep warm during the fall and winter, but it can keep your perennials from growing quickly.

As a handy tip, pull the mulch away from your plants in the springtime to help facilitate faster growth.

FAQs

Conclusion on leaf mulch vs wood mulch

At the end of the day, where and on what you will apply the mulch is the deciding factor for which mulch you’ll choose, may it be a leaf or wood mulch. The former can be lighter but denser, but the latter lasts for a longer duration of time in your gardens.

I know we have covered the 2 types of mulch extensively, and some other ones like compost and grass clippings as mulch. If you are curious to know more about just what you can mulch (spoiler, you can separately mulch sugar cane and rubber!), you can head on to this article that I wrote on the best mulch for your garden through this link.

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Tony O'Neill

I am Tony O'Neill, A full-time firefighter, and professional gardener. I have spent most of my life gardening. From the age of 7 until the present day at 46. My goal is to use my love and knowledge of gardening to support you and to simplify the gardening process so you are more productive

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