University of Florida

Algae in Water Gardens

Just like having weeds in your lawn, you can also have weeds in your water garden. Algae are microscopic weeds that are sometimes a problem in water gardens. Left to grow unchecked, they can cause issues.

Since algae need sunlight in order to grow, you can curb their growth by choosing water garden plants that shade the water. Limit excess nutrients by fertilizing your water garden plants responsibly. Apply only what your plants need, and use slow-release nutrient tablets that can be pushed into the soil.

Don't overfeed or overstock fish, since both can disrupt the nutrient balance.

As a last resort, you can try an aquatic algicide. Always read the label and make sure the product is suitable for use around other plants and fish.


UF/IFAS Publications

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