Invasive/non-native species

                Ravenna Park is a prime habitat for some introduced species. Himalayan Black Berries have become a problem throughout Western Washington and their presence is evidence here in Ravenna Park.  

Here are some invasive/non native species you will find n Ravenna Park.

Native to Asia, the Himalayan blackberry is an evergreen shrub with canes covered in thorns and berries that are edible for humans. It can grow in a variety of environments and often is found along the Ravenna trial, the creek, and some spread through the park.  They shade out smaller, native species, reducing native plant and wildlife diversity.

Invasive Himalayan Blackberry

Invasive English Ivy

Another widespread nonnative species found in Ravenna is the English Ivy.  It’s well-known European vines that are well adapted to our climate. It grows all year round in Western Washington and can out-compete many other plant species. Ivy that grow in ground often host pest animals like rats which increase problems with slope failure as water runs down under the ivy. 

Non-native Japanese Hill Cherry

Another non-native species that you can find in Ravenna Park are these Japanese Hill Cherry. There are only few trees scattered around the park. They aren't as invasive as the Himalayan black berry or the English ivy however, they still compete for resources with our native species.