There is a common misconception that the Florida Everglades is just a giant, grassy swamp. It’s actually made of several different habitats, each full of distinct flora, including trees. When you visit the Everglades, you’ll notice many clusters of trees standing tall against the wet prairie and sawgrass marsh. These small hammocks are known as Everglades tree islands.

What Are Tree Islands?

Tree islands are small forests that sit on land just dry enough for them to take root. But, there’s more to it than that. Everglades tree islands are formed on land that is elevated just slightly, in some cases only by inches!

They can be made of tropical hardwood trees, ferns, cypress, and other topical plant species. Before the Everglades were drained in the 1920’s, the freshwater sheetflow went around the tree islands. As a result, many of them have an elongated, teardrop shape, with the rounded end pointed toward the water flow.

A Shelter for Everglades Wildlife

Being the only spots of dry earth outside of the pine rocklands and hardwood hammocks, tree islands can act as a dry oasis for Everglades wildlife. Reptiles, birds, and mammals that feed in the wet prairie use them for shelter to rest or hide from predators.

Many birds, including the Everglades snail kite, nest on these islands. White tailed deer also frequent them, because if they spend too much time in water they can develop hoof rot, which can be fatal.

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Everglades Snail Kite

Where Did They Come From?

The ground that Everglades tree islands rest on was long-believed to be bedrock that slowly rose over time. It was recently revealed by a team of scientists that these spots were middens, garbage piles from centuries-old human settlements. The researchers found bones, shell tools, and charcoal, which would’ve helped create an elevated dry area where plants could grow.

The phosphates from the bones acted as fertilizer, and the roots reached further into the bedrock for water. This setup helped tree islands to not only form, but continue to thrive now!

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Everglades Tree Island

Everglades tree islands don’t just add an air of mystery to this ecosystem. They enhance its unique beauty as well as its elevation, and also provide homes to countless animals. Taking a private airboat tour at Mack’s Fish Camp can give you the chance to see them up close!