You can add iron-based products to mossy soil to help kill the moss and improve the soil conditions for other plants.
Many factors contribute to moss growth in soil. Addressing these underlying issues, along with using appropriate amendments, can help reduce moss and create a healthier growing environment.
Here's a breakdown of what you can add and why:
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Iron-Based Products:
- What it is: Products containing ferrous sulfate or other iron sulfate compounds are particularly effective at killing moss. A well-known example is Lilly Miller Moss Out!.
- How it works: Iron sulfate changes the soil's pH and creates an environment less hospitable to moss, while not harming most desired plants (when used as directed).
- Important Note: Follow the product instructions carefully. Overuse can stain concrete or other surfaces.
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Lime:
- What it is: Agricultural lime (calcium carbonate) is used to raise the pH of acidic soils.
- How it works: Moss often thrives in acidic conditions. If a soil test reveals a low pH, adding lime can help make the soil less acidic, which is less favorable for moss growth.
- Important Note: Only add lime if a soil test indicates a need for it. Over-liming can cause other nutrient deficiencies.
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Organic Matter:
- What it is: Compost, well-rotted manure, leaf mold, or other decomposed organic materials.
- How it works: Improves soil drainage and aeration, reducing the wet conditions that moss prefers. Organic matter also adds nutrients to the soil, benefitting other plants and helping them outcompete moss.
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Sand (for Clay Soils):
- What it is: Coarse sand.
- How it works: Improves drainage in heavy clay soils. Clay soils retain water, creating a perpetually damp environment that encourages moss. Adding sand can help break up the clay and improve drainage.
- Important Note: Adding too little sand to clay soil can make the problem worse. Amend clay soils with a significant amount of sand (as much as 50% by volume) along with organic matter for best results.
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Fertilizer (if necessary):
- What it is: A balanced fertilizer appropriate for the plants you want to grow.
- How it works: Healthy, vigorous plants can outcompete moss. Fertilizing provides the nutrients plants need to thrive.
- Important Note: Only fertilize if your soil is deficient in essential nutrients, as determined by a soil test. Over-fertilizing can harm plants and the environment.
Before adding anything to your soil, it's highly recommended to get a soil test. This will provide valuable information about your soil's pH, nutrient levels, and composition, allowing you to make informed decisions about the best amendments to use. Correcting poor drainage, improving aeration, and ensuring proper sunlight are also crucial to reducing moss growth and promoting a healthy lawn or garden.
