- Invasive Species- non-indigenous species, or 'non-native' plants or animals that adversely affect the habitats and bioregions they invade economically, environmentally, and/or ecologically.
- Naturalized species - any process by which a non-native organism spreads into the wild and becomes naturalized. A population is said to be naturalized if its reproduction is sufficient to maintain it.
- Exotic Species- (introduced, alien, exotic, non-indigenous, or non-native species) is a species living outside its native distributional range, which has arrived there by human activity, either deliberate or accidental.
- Early blooming, seed production and rapid growth, allowing a plant to shade out competing plants.
- High volume of seed production with efficient dispersal mechanisms. Each flower head of a Musk Thistle produces thousands of feathered seeds capable of broad wind dispersal.
- Deeper taproot systems tapping into scarce water resources.
- Wide range of habitats and tolerance (alkaline soil, acidic soil, shade and sun tolerance, etc.)
- Reproduced by seed or vegetative reproduction- above ground or below ground “runners” (stolons and rhizomes)
- Allelopathic chemicals that inhibit the growth of near by plants. Tree of Heaven is notorious for producing ailanthone which is reported to possess non-selective properties similar to glyphosate (Round Up) and paraquat. Some native species, such as Black Walnut which produces juglone, use this strategy as well.
- Bad taste which deters animals from eating it. Sericea lespedeza has high tannin levels which make it less palatable to both livestock and insects which then eat other neighboring plants.
Over the next year we will be covering current invaders- from the vicious to the early, possible future concerns. My goal is to provide a source of convenient online resources to identify and attack the Invaders of Missouri.