Tomato Week

5 Best Mulches for Tomato Plants + How & When to Mulch

If you’re like most gardeners, you want your tomato plants to produce a bountiful harvest. Mulching your tomato plants is a great way to help them reach their full potential. But what are the best mulches for tomato plants? And how and when should you mulch them?

In this blog post, we’ll answer those questions and more. So keep reading to learn everything you need to know about mulching tomato plants.

What is mulching, and why is mulch important for tomato plants?

What is mulching and why is mulch important for tomato plants

Mulching is a gardening technique that involves covering the ground around plants with a material layer, such as straw, leaves, wood chips, and other materials. The primary purpose of mulching is to conserve moisture in the soil and prevent weeds from growing, but let’s cover all the benefits of adding mulch to your garden and around your tomato plants.

Regulates soil temperature

Mulching your garden can also help to regulate soil temperature and protect plants from extreme weather conditions. When the base of your plants is left exposed to the harsh sun in areas with high elevation or exceedingly high temperatures, the roots can start to fry. This will quickly kill your plants!

Mulches have been shown to cool down the soil temperature by up to ten degrees. And this is significant because soil temperatures are more important than aerial temperatures when growing crops.

Conserves water

Tomato plants are particularly well-suited to mulching, as they require a lot of moisture to produce juicy fruits. Especially in drier and hotter areas, mulching can turn the tide and allow you to successfully grow common garden crops like tomatoes, even if you wouldn’t otherwise be able to.

Applying mulch around tomato plants helps to keep the soil moist and reduces the possibility of fruits cracking due to inconsistent watering. Thoroughly mulching your garden can reduce soil moisture loss by up to 70%, according to Galveston county master gardeners.

Pest control

Some mulches can help to deter some pests from damaging plants. Straw can deter pests from laying eggs on or around your plants, while synthetic mulches like plastic (used as a temporary mulch or for soil solarization) can reduce whitefly and spider mite numbers. Wood chips can decrease the odds of spreading fungal diseases by eliminating some of the splash back that comes with watering.

Be aware that some pests (namely slugs and snails) will be attracted to mulch in wet climates. In boggier or more moist areas, such as the American Pacific Northwest, your mileage may vary when it comes to mulching. Slugs are attracted to dense mulches like grass clippings and dead leaves, so you may have to consider removing some of your mulch if you live in one of these areas.

Weed control

Deeply mulching your tomatoes will help suppress weeds in the area since light won’t be able to reach the weeds or weed seeds under the mulch. Of course, there will be weeds that appear anyway – but they’ll be far fewer in numbers.

Soil revitalisation

Organic mulches will eventually break down and add nutrients back into the soil. This is why it’s often recommended to add mulch to your garden yearly.

Different mulches will break down at different rates, so keep that in mind when making your mulching plans. Wood chips, for example, take much longer to break down than straw or grass clippings. This doesn’t apply to any non-organic mulches, like plastic sheeting.

Mulching is an essential gardening technique for tomato farmers and home gardeners, regardless of where you live. As weather conditions continue to change, adding mulching to your list of gardening skills will benefit you for years to come. Plus, you’ll be able to share tips about the importance of mulching tomato plants with new gardeners who may be having difficulty getting started growing their own tomatoes.

What are the five best mulches for tomato plants, and why are they beneficial?

1. Woodchips


Tomato plants can also be susceptible to disease and pests. One way to help prevent problems is to use wood chips as mulch. Wood chips help to suppress weeds, regulate moisture levels, keep the soil warm during spring, and cool it down during summertime. They also add organic matter to the soil as they break down over time. Wood chips can help to deter pests such as tomato horn worms, and they can reduce the spread of common fungal diseases.

You can usually find wood chips for free locally by asking a tree surgeon or arborist for their extra wood chips. Sites like Chipdrop are an additional resource. Alternatively, consider browsing a local Facebook group or online forum for gardeners to check for offers of free wood chips or renting a wood chipper and shredding some of the tree limbs on your property. Just be sure to choose chips that are free of chemical treatments.

2. Grass clippings

Grass clippings

Many people think of grass clippings as nothing more than lawn waste, but they can actually be quite helpful in the garden. One way to use them is as mulch. Mulch helps to regulate soil temperature, prevents weed growth, and retains moisture.

Grass clippings make an excellent mulch for tomato plants. They are high in nitrogen, essential for tomato plant growth, and they help keep the soil moist. Plus, they break down quickly, so you don’t have to worry about them smothering your plants. You can get grass clippings for free by mowing your lawn or asking a neighbour for theirs. So instead of throwing out your grass clippings, put them to good use in your garden.

3. Leaves


Many gardeners mulch their plants with leaves in the fall, and there are good reasons for doing so. Leaves are an excellent source of nutrients and help maintain moisture levels in the soil. They also provide a layer of protection against cold temperatures and frost damage. In addition, leaves break down quickly, adding valuable organic matter to the soil.

You can get leaves for use as mulch from your yard, or you can ask a neighbour for permission to collect leaves from their property. Many cities also have leaf-recycling programs that allow residents to drop off leaves at designated locations. The leaves are then shredded and used as mulch in public parks and gardens.

4. Compost


Compost is a great choice for mulch because it contains nutrients that tomato plants need. In addition, compost helps to regulate moisture levels and prevent weed growth. Where can you get compost for use as mulch in the garden? You can purchase compost from many hardware stores and nurseries.

You can also make compost at home. To make compost, you will need to collect kitchen scraps and yard waste. Once you have collected enough material, you will need to find a location for your compost bin. The best location for a compost bin is in a shady spot that has good drainage. Once you have found a location for your bin, you can start adding material to it.

You should turn the material in the bin every few weeks to help speed up the decomposition process. After several months, your compost will be ready to use as mulch in the garden.

5. Straw


Straw helps to regulate moisture levels in the soil, keeping roots healthy and preventing plants from drying out. In addition, it helps to prevent weed growth and can keep tomato plants warm during the cool months of the year.

Straw is relatively easy to find and usually quite inexpensive, making it a great option for gardeners on a budget. It’s also easy to apply, meaning you can get your mulch layer up quickly. If you’re looking for an effective and affordable mulch option, straw is worth considering.

When looking for straw for your garden, one thing to consider is to check with whoever is supplying it that the straw wasn’t sprayed with any pesticides. Introducing commercial pesticides to your home garden can be difficult and time-intensive to recover from.

When should you mulch tomato plants?

When should you mulch tomato plants

Most tomato growers mulch at the beginning of the season after the plants have been transplanted into the garden. This gives the plants a chance to become established before being covered with mulch.

However, you can also mulch later in the season once the plants have begun to produce fruit. The main downside of late mulching is that it can encourage fungal diseases, which thrive in humid conditions. For this reason, many tomato growers choose to stick with early-season mulching.

Adding organic mulches to your garden beds in autumn is another popular option. This is usually done in addition to the first mulch application in the springtime. Autumn mulching helps to improve soil quality and provides nutrients that tomato plants need for the following growing season.

No matter when you choose to mulch your tomato plants, make sure to do it before the first frost of the season. This will help protect the plants from cold damage and allow them to continue producing fruit until late autumn in some zones.

How to mulch tomato plants?

A 2-3 inch layer of organic tomato plant mulch is ideal. You can use any of the options we discussed above. A layer of mulch thicker than 3 inches is not generally recommended for tomatoes because it will reduce airflow to a detrimental degree, which can become a problem for spreading disease among your tomato plants.

Apply the mulch after the soil has warmed in spring and tomato plants have been transplanted. Be sure to pull the tomato plant mulch back from the direct base of the plants. Doing this discourages insects from making that area their home and reduces the chance of your plant’s stems rotting.

Avoid letting the tomato plant mulch touch the leaves, which could invite disease. Pruning the first few branches from your tomato plant and leaving a bit of clearance is the best way to address that issue.

Tomato Plant Mulch Q&A

Should you put much on tomato plants?

Yes, in most cases! Mulch has numerous benefits to tomato plants, including pest control, disease prevention, soil moisture levels, and more.

What is the best tomato plant mulch?

The most popular mulches for tomatoes are straw and woodchips, but the answer is that it depends on your local weather conditions, rainfall, the pests in your area, and what you’re trying to grow. I recommend avoiding leaves and grass clippings if your area is wet and rainy. If you’re somewhere dryer, you can probably use any mulching option successfully.

Should you mulch tomatoes with woodchips?

Woodchips are an excellent tomato plant mulch option because they prevent soilborne and fungal diseases, which are extremely common among tomato plants. I recommend giving woodchips a try for mulching your tomato plants if you can get ahold of some.

What kind of mulch should I use for potted tomato plants?

Mulching your tomatoes in containers is an excellent idea because container gardening is notorious for being water-intensive, and the mulch will help retain soil moisture. Try using straw or bark/woodchip mulch in your potted tomato plants.

What is the best compost for tomatoes?

Using compost on your tomato plants can be an effective way to mulch them and nutrients to the soil, but make sure the compost you’re using is free-draining for the best results. You want a looser blend rather than ultra-compacted compost.


Mulching is an affordable (sometimes even free) way to benefit your garden and improve the soil quality of your land. Only a few zones or climate conditions wouldn’t benefit from mulch in the garden.

All five of these mulches are worth trying out in your garden to see what your tomato plants like more. Once you lock in the best mulch option, you know what kind of mulch you need to produce or source in bulk, which will simplify your gardening efforts.

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