How Earthworms Help Forests Grow

Beneath every healthy forest is a team of tiny workers quietly helping trees, flowers, and plants grow. Earthworms are some of the most important animals in a forest ecosystem; without them, the forests we love exploring would be very different.

Earthworms Are Nature's Gardeners

Every day, earthworms move through the soil searching for dead leaves, old roots, and other decaying plant material. As they feed and tunnel underground, they improve the soil in several important ways. Although one earthworm may seem small, millions of earthworms working together can transform an entire forest floor.

Earthworms Help Air Reach Plant Roots

Healthy plants need oxygen just as much as they need water. As earthworms burrow through the soil, they leave behind tiny tunnels. These tunnels allow fresh air to move deeper into the ground where plant roots are growing. Without enough oxygen, roots cannot grow as well or absorb nutrients efficiently. Every tunnel an earthworm creates helps improve the soil for the plants growing above it.

Earthworms Help Water Soak Into the Ground

Have you ever noticed puddles after a heavy rain? In healthy soil, much of that water soaks into the ground instead of sitting on the surface. Earthworm tunnels act like tiny underground pathways that help rainwater travel deeper into the soil. This water becomes available to plant roots instead of quickly running off the surface.

The next time it rains, remind your child that thousands of tiny tunnels beneath their feet are helping move water through the forest.

Earthworms Recycle Nature's Leftovers

Every autumn, trees drop thousands of leaves, flowers fade, grasses die back, and small twigs fall to the ground. Instead of allowing all this plant material to pile up forever, earthworms begin recycling it.

They feed on dead leaves and other decaying plants, breaking them down into smaller pieces. As the material passes through the earthworm's body, nutrients are returned to the soil where new plants can use them. Scientists call this process nutrient cycling.

Children can think of it as nature's recycling system. Yesterday's fallen leaves help grow tomorrow's forest.

What Are Worm Castings?

As earthworms digest their food, they leave behind small piles of waste called worm castings. Worm castings are packed with nutrients that plants need to grow. They also improve the soil's structure and help it hold moisture.

Many gardeners even add worm castings to their gardens because they are a natural fertilizer.

Healthy Roots Begin With Healthy Soil

Plant roots grow beneath the ground where we cannot easily see them. Those roots depend on healthy soil for water, oxygen, and nutrients. Earthworms help improve airflow with their tunnels by helping water reach deeper into the soil, and their castings add nutrients. Together, these changes create an environment where roots can grow stronger and healthier, growing healthy plants.

Why Forests Need Earthworms

A forest is a community of plants, fungi, insects, birds, mammals, and countless other living things. Earthworms support many of them by improving the soil; they help trees grow. Trees provide food and shelter for birds, squirrels, insects, fungi, and many other animals. One small amazing earthworm helps support an entire forest ecosystem!

Why Gardeners Love Earthworms

Gardeners LOVE to find earthworms in their gardens! Earthworms naturally improve the soil without using machines or chemicals. They loosen compacted soil, mix organic matter into the ground, recycle dead plants, and leave behind nutrient-rich castings. A garden with healthy earthworm populations often has healthier soil.

What Would Happen If There Were No Earthworms?

Imagine a forest where dead leaves never broke down. Year after year, leaves would continue piling up. The soil would contain fewer recycled nutrients. Rainwater would have a harder time soaking into the ground. Plant roots would receive less oxygen.

Although other organisms like fungi, bacteria, and insects also help decompose dead plants, earthworms play an important role in this process in many ecosystems. Healthy forests depend on many different living things working together. Earthworms are one important part of that team.

What to Notice Together

The next time you visit a park, encourage your child to become a soil detective.

Ask:

Can you find a place where dead leaves are breaking down?
Can you find small holes or tunnels in the soil?
Is the soil soft or hard?
Can you gently move aside a few leaves and look for earthworms?
What do you think the trees would look like without healthy soil?

Sometimes the most important discoveries happen beneath our feet.

Try This at Home

Choose two small areas in your yard or a local park. One area should have lots of fallen leaves and the other should have very few.

Ask your child: "Where do you think we'll find more earthworms?"

After looking carefully, talk about why earthworms choose places with plenty of food and moist soil.

Simple investigations like this help children understand that every animal lives where its needs are met.

Continue the Adventure Outdoors

Reading about how earthworms help forests grow is a wonderful beginning. Watching an earthworm disappear beneath a layer of leaves, feeling the soft forest soil, and discovering the many signs of life beneath your feet helps children understand that even the smallest animals play an important role in nature.

At Little Hikers Long Island, families explore local parks together while discovering how plants, insects, animals, fungi, and even the soil are connected. Every class encourages children to slow down, observe closely, ask questions, and build a deeper appreciation for the natural world.

If you would like to continue exploring the nature of Long Island together, we would love to have you join us on the trail.

About Little Hikers Long Island

Little Hikers Long Island is a fully outdoor parent and child nature program at West Hills County Park in Huntington, New York. Through hands-on exploration, families learn about the local plants, insects, animals, and seasonal changes found right here on Long Island. Children learn to observe closely, ask thoughtful questions, compare what they see, and build a lasting relationship with the natural world around them.

Our goal is to help children become careful observers, confident explorers, and future stewards of the places they call home, because children protect what they understand.

Item added to your cart