The colors of Spring are always a welcome sight after months of dull greys and browns throughout the Patapsco valley. Shades of greens and bright pinks dot the branches as our favorite trees begin to fill out again. As exciting as these changes are, some of them only appear to be the regrowth of our native forest. Many examples of early blooms and spring growth are actually invasive plants that spread throughout native forests and threaten to disrupt the native ecosystem.
Invasive plants are species of plants introduced to local areas from foreign ecosystems, often Europe or Asia, that pose a threat to native ecosystems. This threat can manifest itself in a variety of ways. Perhaps the most common form is unchecked growth by the invasive due to a lack of predators. These plants can see explosive growth because unlike their native counterparts, no local animals eat them and keep their numbers in check. Before long they have monopolized the available resources such as space and sunlight and force out any remaining native competitors.
Here are some examples of these plant invaders that are common in the Patapsco Valley:
This shrub is easily identified by its reddish fuzzy stem and bright green leaves. Often found along trails and in patches, this plant produces berries in the summer and will spread if allowed to.
This vine is rampant throughout the Patapsco, found both in developed and wooded areas. Often planted for aesthetic reasons or in gardens, english ivy grows quickly and will climb tree in search of sunlight. As the plant grows it will cover and eventually smother its host tree, making it a serious threat to even our most established forests.
This is often found as a short ground cover in the understory of the Patapsco and throughout small patches of earth in developed areas. Celandine spread quickly and can give an area the appearance of having a “green carpet” as it covers the forest floor.
This shrub has a woody stem and small, bright green leaves that turn red over time. It is also covered in long skinny thorns about a half inch in length, making removal or even just touching this shrub painful. Barberry has numerous negative impacts on our ecosystem, including increasing local tick populations! Barberry is so impassible by larger predators (owls, hawks, and foxes) that is provides an unusually safe home for rodents. As the rodent population grows and congregates under these shrubs they support more ticks and eventually increase the spread of lyme disease!
Help us repel these invaders!
Want to get out and help the Patapsco ecosystem yourself? Send us a picture of your work removing invasives, and a description of the total to Info@Patapsco.org and we will give you a shoutout for your help!