Friends of the Wild Flower Garden

Invasive Plant Removal at the Maple Glen
Eloise Butler Wildflower Garden & Bird Sanctuary

invasive collage

The Friends Invasive Plant Action Group (FIPAG) has been busy since 2014 removing Buckthorn and Garlic Mustard from the Maple Glen just Southeast of the Garden's South Gate.

Some photos and commentary

 


2014 - the beginning of work.

Jim Proctor and Liz Anderson wrote about the new area to be worked on.

“So what’s next for the invasives group? Thanks to a recently adopted cooperative arrangement between the Park Board and the Friends of the Wild Flower Garden, FIPAG will be involved in a truly beautiful and extraordinary project. Outside the Garden, at its eastern edge, a wide gravel path runs from the driveway/parking area to the Garden. A tall impenetrable buckthorn hedge has bordered the gravel path, obscuring the deep ravine of maples, oaks and hemlocks that lies behind it. Earlier this summer, the Park Board agreed to work with FIPAG to remove invasives there. The goal is to remove the invasives that encircle the ravine.”

Below: The impenetrable buckthorn hedge that Jim Proctor writes about.

Buckthorn hedge.

2015/2016

Jim Proctor wrote:

“At times I get a bit overwhelmed by the scale of what we are trying to do, but all I have to do is look at the areas we started in almost a decade ago to remind myself of what is possible. In those areas I see a rich diversity of shrubs and young trees filling in the gaps left by buckthorn, and a more varied ground layer of wildflowers. I see a protective zone surrounding our beloved Wildflower Garden, one that will send a rain of native seeds into its midst rather than a deluge of seeds of just a few invasive species. Now we are attempting the same strategy for another beautiful natural community close by.”

FIPAG held three buckthorn pulls in the Maple Glen next to the Garden, running into a lot of poison ivy.

Below: Volunteer Mary with Buckthorn removed during the Fall 2016 work in the Maple Glen. Photo Liz Anderson.

cut buckthorn
Maple Glen before work
Above: The area of the Maple Glen FIPAG worked on in October 2106 before work started. Photo Liz Anderson.
Maple Glen after work
Above: The area of the Maple Glen FIPAG worked on in October 2106 after the work. Photo Liz Anderson.

Below: The area of the Maple Bowl SE of the Garden entrance where FIPAG had begun the work of clearing buckthorn in the Fall of 2015. Photo 2017 - G D Bebeau.

Maple Bowl

Below: A view of the Maple Glen showing the amphitheater-like surroundings - Spring 2018. Photo G D Bebeau.

Maple Glen hillside

2017

FIPAG held three buckthorn pulls in the Maple Glen next to the Garden, in October. Jim Proctor wrote this in the Fall issue of The Fringed Gentian™:

vernal pool
Glimmer of a Vernal Pool.
[Photo Jim Proctor]

As I write this I am basking in the glow of a productively destructive buckthorn pull in our Volunteer Stewardship Area in the maple bowl south of the Garden. A dozen volunteers with the Friends Invasive Plant Action Group participated in this first of three fall weeding events. Aside from the threat of rain, our group had another, more sinister specter hanging over our heads: erosion. We’ve worked on slopes before, but this time we were weeding in a valley with several complicating factors that made us especially vigilant in our attempts to prevent soil from washing downhill.

Foremost in my mind was the presence of a vernal pool nested in the bottom of the ravine. According to Wikipedia, “Vernal pools … are a distinctive type of wetland usually devoid of fish, and thus allow the safe development of natal amphibian and insect species unable to withstand competition or predation by fish.” We certainly heard frogs in the pond; in fact, a lone chorus frog was calling out as we worked. Raw soil flowing into the pool would damage this critical habitat.

Second was the extent of the slope itself. It is longer and steeper than anything we’ve tackled before. You get the picture; more distance for water to pick up speed and more area to gather soil.

A third factor contributing to erosion was the nearly absent layer of ground vegetation in large areas of the valley. We assume this is due largely to the presence of earthworms and the severe dominance of buckthorn. When we remove all buckthorn in a given area, it almost looks like we’ve plowed the soil, with nothing living remaining! We’ve done some replacement planting in the past, but we mostly depend on remnant native plants and seeds in the soil to fill in. Here, the natural processes may take too long or not happen at all in the worst areas.

So what are we to do? First, we asked volunteers not to pull all the buckthorn as they went along. I assure you it’s not easy for a seasoned buckthorn buster to pass by a buckthorn that could just as easily be pulled, but that’s what we did. The invasive shrubs we left behind will continue to grow, but since they are mostly second-growth buckthorn stems from a cut several years ago, none are fruiting yet. They aren’t likely to contribute to the weed seedbed in one more year.

We also have decided to start seeding in a native cover crop as we work. After consulting with Garden Curator Susan Wilkins, we purchased native wild rye to scatter just before we pull buckthorn in the next two weeding events. The seed will work into the soil as we do our thing. It should have a chance to germinate this year and provide some protection from erosion in the spring. We plan to add in other native species next fall.

Below: A view of the pool - Spring 2018. Photo G D Bebeau.

Maple Glen pool in spring

Below: A view of the pool on Aug. 2, 2018. The pool has maintained water all Summer and is coated with green algae. Not a vernal pool, but one that is maintained in a normal rainfall year. Photo G D Bebeau.

Pool in late Summer 2018

Below: The hillsides of the bowl and the south and west are covered with extensive growth of Interrupted Fern, similar to the hillside in Eloise Butler. Photo G D Bebeau.

Maple Bowl Ferns