10 Invasive Plants to Ban from Your Yard (And Why They Destroy Ecosystems)

Invasive plants are ecological bullies—non-native, enemy-free, and aggressive. They displace natives, collapse food webs, and alter habitats. Here are ten widespread offenders in the U.S.

1. Cajeput Tree (Melaleuca quinquenervia)

Australian ornamental gone wild in FL/LA wetlands. Forms dense, fire-prone stands that eliminate sawgrass prairie and its wildlife.

2. Cogongrass (Imperata cylindrica)

African/Asian grass introduced for forage/erosion. Impenetrable root mat chokes natives from TX to SC and OR. Thrives on disturbance.

3. Japanese Honeysuckle (Lonicera japonica)

1862 NY ornamental. Woody vines to 30 ft strangle trees. Invasive in every state east of Mississippi (except ME, AL, MS) plus KS, OK, TX, HI. Still sold as ground cover.

4. Kudzu (Pueraria montana var. lobata)

"The vine that ate the South." 1 ft/day growth, 100-ft vines, 4" diameter. Smothers and uproots trees. No natural enemies here; controlled by insects/fungi in Asia.

5. Leafy Spurge (Euphorbia esula)

European seed contaminant (early 1800s). Dominates dry, disturbed soils across northern tier states to WA, plus CA, VA, NC. Bio-control insects being tested.

6. Mile-a-Minute (Persicaria perfoliata)

1930s ornamental contaminant. Barbed vines climb to canopy, block light, weaken trees. Spreading through New England, Mid-Atlantic, Midwest, OR.

7. Purple Loosestrife (Lythrum salicaria)

European wetland invader (early 1800s, ship ballast). Massive seed output (wind/water spread). USDA imports three European beetles for bio-control.

8. Russian Olive (Elaeagnus angustifolia)

Early 1900s windbreak/oramental. Now in every state and all Canadian provinces. Disrupts succession, drains aquifers, outcompetes across habitats.

9. Tamarisk / Salt Cedar (Tamarix ramosissima)

Early 1800s ornamental. Dominates western watercourses. Tolerates saline/alkaline water. Lowers water tables, destabilizes streams. Manual, chemical, bio-control used.

10. Tree-of-Heaven (Ailanthus altissima)

1700s import. Grows in sidewalk cracks, damages foundations. Allelopathic (toxic chemicals suppress neighbors). Foul-smelling wood/sap. Invasive across West.

Take Action

Learn your state's invasive list (USDA, extension, master gardeners). Remove invasives. Plant natives. Every yard is a frontline.