Last spring, while hiking through a really great sinkhole with a mesic forest, we discovered a new exotic for the site location: Veronica hederifolia, a little speedwell, a small and hairy annual that was carpeting the location of native spring wildflowers. We pulled a sackful of it, but, apparently the seeds had blasted out already. This spring, visiting the same site, we documented a full-on infestation of this plant native to Eurasia. This little lawn weed didn't get here on it's own, it surely came in on a shoe of a hiker and found a perfect home in a moist bottomland forest system once rich with bluebells and Dutchman's breeches.
Fast forward one growing season later and this annual weed (common to lawns in St. Louis) has all but overtaken the native flora in this high quality designated natural area sinkhole. Collectively, we have pulled several trash bags full of this plant this year. With it being an annual and seeding readily, I don't know if we'll ever get a hold on it. Staff have continued to pull and bag and discard, over and over and over again, but the plant persists. One little seed made its way into this intact natural community and now it's threatening the very existence of it. Homogenization is happening in our lifetime, our timeframe. Biodiversity is threatened by an onslaught of homogenization, not only from exotic species like this Veronica but by deer, by the lack of fire, and the worst of all, bush honeysuckle. We need to be vigilant, and if it takes multiple visits to hand pull this little exotic weed, we should keep doing it. So few natural communities have a semblance of biodiversity left, we must preserve what we can as assiduously as humanly possible.