To the editor:

The smell of Pumpkin Spice Lattes can only mean one thing – fall is coming! With that, leaves will soon be turning vibrant colors and will eventually fall from the trees. This colorful display is beautiful, but even though leaves are a part of our environment, they can be very harmful to our lakes and waterbodies if they’re not disposed of correctly.

Leaves should never be raked or blown onto the road or into waterways. Leaves contain phosphorus, an essential nutrient for plant growth. As the leaves decompose, they release the phosphorus that was bound up in the leaf. When it rains, leaves that are on the roadway will be carried by runoff into the storm sewer, which eventually outfalls to a pond, lake, ditch, or wetland. The waterbody is where the phosphorus will be released, causing algal growth and excessive algae blooms.

Five bags of leaves are equivalent to one pound of phosphorus, which is capable of producing 1,000 pounds of algae in a lake.

Instead of raking or blowing leaves off of your property, mulch leaves by running over them with a lawnmower. Leaves and grass clippings are great fertilizers for your lawn. Also, leaves can be raked into a compost pile for a nutrient-rich fertilizer for gardening or plant growth next spring. Some trash collection services also collect yard waste, which is another great place to dispose of leaves.

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Please do your part this fall to keep our waters healthy!

Laura Hagstrom

On behalf of the city’s Stormwater Management Committee

Alexandria, MN