Protecting Native Habitat: Reasons to Remove Invasive Plants

Why You Should Remove Invasive Plants from Your Florida Landscape

One thing I particularly love about encouraging people to grow Florida native plants is the fact that it’s simple and non confrontational. Generally speaking, one can recommend that people add native plants to their landscaping without them having to make much effort.  If they’re already in the market for a plant, why not choose the plant that is low maintenance AND provides ecological benefit? That being said, we cannot ignore the elephant in the room: invasive plants. Florida’s diverse ecosystems and warm climate make it a paradise for plant growth, but unfortunately, this ideal environment also invites numerous invasive plant species to take root. While many of these plants may seem beautiful or even useful, they pose a significant threat to native flora and fauna, leading to long-term environmental, economic, and even personal health issues. This article will dive into the importance of removing invasive plants from your landscaping in Florida, highlight the impact of certain harmful species—like the Mexican petunia, air potato, cogongrass, paper mulberry, and mimosa tree—and discuss the risks associated with seemingly harmless plants, such as perennial peanut.

What Are Invasive Plants?

Invasive plants are non-native species introduced into an area, either intentionally or accidentally, which grow and spread rapidly, often outcompeting and displacing native plants. Unlike native species, invasive plants usually lack natural predators in their new environments, allowing them to spread unchecked. Over time, they can disrupt ecosystems, crowd out native plants, reduce biodiversity, and create a monoculture that is harmful to native wildlife.

Why Removing Invasive Plants Is Crucial for Florida’s Ecosystem

Florida’s unique ecosystems include wetlands, forests, beaches and prairies, and all depend on the delicate balance between the native plants and animals. When invasive plants take over, they disrupt this balance, leading to various negative consequences.

Why removing invasive plants is essential:

1. Preservation of Native Plant Species
   Native plants are crucial to maintaining Florida’s biodiversity. They provide food and habitat for native wildlife, from pollinators like bees and butterflies to larger animals. Invasive species often grow aggressively, quickly replacing native plants, thus reducing food sources and habitat for wildlife. For instance, the Mexican petunia, an attractive plant with vibrant purple flowers, may seem like a good landscaping choice, but it can overtake native vegetation, making it harder for local species to thrive. Once you plant Mexican petunia, you will spend several years attempting to remove it from your landscape.
2. Protection of Wildlife Habitats
   Florida’s wildlife depends on native plants for food, shelter, and breeding grounds. When invasive plants dominate an area, they eliminate the native species that animals rely on. For example, cogongrass, one of the state’s most invasive grasses, forms dense mats that are impenetrable to most native wildlife, making it difficult for animals to access necessary resources.
3. Reduction of Wildfire Risks
   Certain invasive plants, such as cogongrass, are highly flammable and increase the risk of wildfires. Cogongrass produces a thick, dry thatch that catches fire easily and burns intensely. As cogongrass spreads, it replaces native plants that are less flammable, making landscapes more vulnerable to fires. Studies show that Florida sandhill habitats with widespread cogongrass invasion burn at higher temperatures than that of a sandhill habitat with native plants (Lippincott, 2000, p. 145). Removing invasive plants from your property not only protects your home but also reduces the potential for large-scale wildfires that threaten entire communities.
4. Economic Benefits
   The cost of managing invasive species in Florida is approximately $45 million annually, with over 90% of the funding provided by the state (Hiatt et al., 2019, p. 1). By taking preventative action in your landscape, you reduce the financial strain on both local communities and government agencies tasked with invasive plant control. Managing invasives like the air potato and paper mulberry in your yard can prevent the need for costly eradication efforts down the road.
5. Aesthetics and Property Value
   Invasive plants often create unsightly, unmanageable landscapes that can reduce property values. For example, the aggressive spread of air potato and mimosa tree can turn a well-maintained yard into a tangled mess of overgrowth. Removing these plants can not only improve the look of your property but also make your yard more appealing and manageable.

Harmful Invasive Plants in Florida to Watch Out For

Let’s take a closer look at some of the specific invasive plants that are particularly harmful to Florida’s ecosystems and should be removed if found on your property. Some of these are universally hated, while some are loved by many due to medicinal properties or aesthetics.

1. Mexican Petunia (Ruellia simplex)

•  Why It’s Harmful: This attractive plant has purple flowers and is popular in landscaping, but it’s extremely invasive in Florida. Mexican petunia spreads both by seed and underground stems, forming dense clusters that outcompete native species.
•  Impact: It reduces biodiversity, threatens native plant habitats, and limits resources for wildlife.

2. Air Potato (Dioscorea bulbifera)

•  Why It’s Harmful: Known for its rapid vine growth, air potato can quickly cover and choke out other plants, smothering entire ecosystems.
•  Impact: It disrupts forest canopies and endangers native tree species, reducing habitats for birds and other wildlife.

3. Cogongrass (Imperata cylindrica)

•  Why It’s Harmful: Cogongrass forms dense, highly flammable mats that spread aggressively.
•  Impact: It poses a significant fire risk, crowds out native grasses and plants, and changes soil composition, making it harder for other plants to grow.

4. Paper Mulberry (Broussonetia papyrifera)

•  Why It’s Harmful: This fast-growing tree spreads easily and creates dense shade, preventing other plants from receiving sunlight.
•  Impact: Paper mulberry can quickly dominate forest edges and disturbed areas, outcompeting native species and altering local ecosystems.

5. Mimosa Tree (Albizia julibrissin)

•  Why It’s Harmful: Often used as an ornamental tree, the mimosa tree produces large numbers of seeds that spread easily, allowing it to invade natural areas.
•  Impact: Disrupts native plant communities by outcompeting native species, particularly along the forest’s edge.

Beware of Potentially Invasive or Problematic Species

While some plants aren’t classified as invasive, they can still pose problems in Florida landscapes. One example is perennial peanut (Arachis glabrata). Though it’s used for erosion control and as a ground cover, it spreads easily and can be difficult to manage. In some cases, it competes with and displaces other native groundcovers, which can be problematic if not carefully controlled. Perennial peanut is often recommended as a “Florida friendly” alternative to a grass lawn, but I am personally dealing with its invasive nature on our farm. This plant is growing abundantly on an adjacent property to our farm and has recently began to appear on the southern end of our property as well as in the Cross Florida Greenway.  

Steps for Removing Invasive Plants

1. Identify and Prioritize: Begin by identifying invasive species in your landscape and prioritizing the most harmful ones, like air potato, mimosa tree,  paper mulberry, and cogongrass.
2. Use Safe Removal Techniques: For smaller infestations, hand-pulling can be effective. For larger plants like the paper mulberry or mimosa tree, you may need to cut and treat the stump to prevent regrowth. We have had great success on our farm painting the freshly cut stumps with herbicide in the winter or very early spring before they break dormancy. We take herbicide use very seriously and are extremely cautious.
3. Dispose Properly: Do not compost invasive plants, as seeds or roots may survive. Instead, dispose of them in a garbage bag so they cannot further spread. Do not send them out with your yard waste.
4. Replant with Native Species: Replace removed invasive plants with species that are native to your area that benefit local wildlife and require less maintenance.
5. Monitor Regularly: After removal, check your landscape regularly for any regrowth or new invasive plants that may appear. Depending on the species, multiple herbicide applications may be required over multiple growing seasons.

Removing invasive plants from your Florida landscape is one of the best things you can do to protect local ecosystems, support wildlife, and maintain a healthy, sustainable garden. By addressing the presence of harmful species you help safeguard Florida’s unique biodiversity. While some plants, like perennial peanut, may offer benefits, they can also become problematic if left unchecked. Taking proactive steps to manage these species will ensure that Florida’s natural landscapes remain vibrant, diverse, and resilient for generations to come. For more information on invasive plants, visit the UF Center for Aquatic and Invasive Plants.

-Amanda Scacchi, Goldenrod Meadows

Citation

Lippincott, C. (2000). Effects of Imperata cylindrica (L.) Beauv. (Cogongrass) Invasion on Fire Regime in Florida Sandhill (USA). Natural Areas Journal 20:140–149. http://www.naturalareas.org/docs/85NAJ2002_140-149.pdf

Hiatt, D., Serbesoff‐King, K., Lieurance, D., Gordon, D. R., & Flory, S. L. (2019). Allocation of invasive plant management expenditures for conservation: Lessons from Florida, USA. Conservation Science and Practice, 1(7). https://doi.org/10.1111/csp2.51