Does Your Hardwood Mulch Have Artillery Fungus?

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Is Artillery Fungus Harmful to Humans? [Explained] Grow Your Yard

Does Your Hardwood Mulch Have Artillery Fungus?

What is Artillery Fungus?

Artillery fungus, also known as shotgun fungus, is a type of fungus that commonly grows on decaying organic matter such as hardwood mulch. It is named artillery fungus because it shoots spores high into the air, resembling miniature artillery fire.

How Does Artillery Fungus Affect Hardwood Mulch?

When artillery fungus grows on hardwood mulch, it can cause unsightly black spots on nearby surfaces such as siding, cars, and windows. These black spots are caused by the spores that are launched by the fungus. Once the spores land on surfaces, they stick and are difficult to remove without causing damage.

What Causes Artillery Fungus to Grow on Hardwood Mulch?

Artillery fungus thrives in moist environments and is commonly found on hardwood mulch that has not been properly aged or composted. The fungus feeds on the decomposing organic matter and releases spores as part of its reproductive cycle.

Can Artillery Fungus Be Prevented?

While it is difficult to completely prevent artillery fungus from growing on hardwood mulch, there are some steps you can take to minimize its occurrence. Firstly, make sure to properly age or compost your hardwood mulch before using it in your garden. This helps to reduce the chances of fungus growth. Additionally, avoid over-watering your mulch as excessive moisture can create a favorable environment for fungus to thrive.

How Can You Remove Artillery Fungus Spots?

If you notice black spots caused by artillery fungus on surfaces around your garden, it is important to address them promptly. To remove the spots, you can try using a mixture of water and mild detergent. Gently scrub the affected areas and rinse thoroughly. In some cases, the spots may be difficult to remove, and you may need to seek professional help.

Is Artillery Fungus Harmful to Humans or Plants?

Artillery fungus is generally not harmful to humans or plants. However, the black spots it leaves behind can be unsightly and difficult to remove. Additionally, if the fungus is allowed to spread, it can potentially affect the overall health of your garden plants by competing for nutrients.

Are There Alternative Mulch Options?

If you are concerned about artillery fungus or simply want to explore other mulch options, there are several alternatives available. Some popular alternatives to hardwood mulch include pine straw, shredded bark, compost, and gravel. These alternatives have their own advantages and disadvantages, so it is important to choose one that suits your specific needs and preferences.


While artillery fungus can be a nuisance and cause unsightly black spots, it is possible to minimize its occurrence by properly aging or composting hardwood mulch and avoiding over-watering. If you do notice black spots caused by the fungus, prompt action is necessary to prevent further damage. Alternatively, you can consider using alternative mulch options that are less likely to harbor artillery fungus. Ultimately, the choice of mulch depends on your personal preferences and the specific requirements of your garden.

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