Getting the upper hand on mighty phragmites

Getting the upper hand on mighty phragmites

Phragmites australis australis in North Canaan.

John Coston

Finally rain. For weeks, the only place there had been moisture was in the marsh and even there, areas that usually catch my boots in the mud were dry. I could not see the footprints of the bear (or is it deer?) that have been digging up and eating the underground skunk cabbage flowers. Not that I could do anything to stop it. A layer of snow that actually sticks around for a while seems like wishful thinking these days.

Masses of skunk cabbage, Symplocarpus foetidus, appeared one spring, like magic, after we hired a team to remove the barberry from about an acre of the marsh adjacent to the driveway. Of course, it had been there all along, waiting patiently underground or hiding in the barberry’s thorny shrub-cages, but we had not seen it. That was about eight years ago; after the barberry’s removal there have been successive infestations of invasives but also, as with the skunk cabbage, some welcome new sightings of native plants.

I wrote in this column last year about Japanese stiltgrass, Microstegium vimineum, and the success in using the weed torch on a large patch of it in the marsh. It remained largely free of this annual invasive grass this year but we switched to hand weeding the area as, given the dry weather, we could not use the torch even in the marsh. Over the course of three weeks, we pulled out what amounted to 6 trash bins stuffed solid with the hairlike strands. As many of them have seedheads we will burn them once the ban is lifted. I should have paid attention to the stiltgrass infestation earlier in the season but walking near Route 7 is not the most peaceful thing to do so I tend to avoid it.

Twice a year I make my way into the marsh as far as I can go until halted by barberry and multiflora rose to hold at bay another grass, this one a giant compared to stiltgrass. Phragmites australis is a tall reed with a pouf of a seed head that is abundant in moist and wet areas everywhere in the US. It is so aggressive in wetlands that it quickly becomes a monoculture- a sea of swaying beige. It not only crowds out other plants but changes the pH of the surrounding soil and water so nothing native can grow in it. It is a real habitat killer. Drive on route 41 toward Sharon from Hotchkiss school and you will see a large field of phragmites on the left-hand side of the road. Once identified you cannot unsee how it has hijacked our landscape.

Thanks to my gardener’s help cutting down barberry, multiflora rose and honeysuckle in the marsh last winter, this year my access was greatly improved to a stand of phragmites-about a third of an acre of it. With each visit I cut down as much of it as I could to eliminate the possibility for it to grow a seed head. Though loathe to use an herbicide, last year I experimented on a small area, dabbing the cut ends with a wetlands ‘safe’ herbicide. (No herbicide is really safe for the environment but often the chemicals that are added to the herbicide to help it penetrate the leaves are especially damaging.) That application seemed to work so I may repeat it next year on another area.

With all invasives, getting rid of them when you see a first few pop up will pay off. That is what is happening on Cream Hill Road in Cornwall where a small stand of phragmites was recently cut under the water line, a natural technique that attempts to ‘drown’ the plant. The next step will be to cover with a black tarp any remaining phragmites that come back from this first effort. According to Heidi Cunnick, who chairs the Cornwall Conservation Commission, their new policy prioritizes the invasive plants for removal so that small infestations can be eliminated early. Cunnick reminds me that there is a biological control for phragmites that remains under review by a US government department but the future possibility of such an eradication method is not stopping activities to reduce populations- now - in Cornwall.

Another example of successful eradication comes from the Twin Lakes area; a couple who moved to a property that came with a quarter-acre of phragmites colonizing in and around their pond. They valiantly did the work themselves as they could not find anyone who would do it for them. A cut and tarp method was used here for the on-land plants; the ones underwater were cut a foot below the water surface over several years. While most is gone, the battle continues with stragglers; these are tackled with aquatic use herbicide using a dabber on the cut end of a stem or sprayed on a glove that is rubbed over the green stem.

It is hard to stay positive; the work can be hard and tiresome. And it is always a gamble that the area you are working on will grow in with native plants rather than with more invasives. Sometimes you clear a patch of barberry and it gets filled with stiltgrass; you try again. Sometimes you get a patch of goldenrod- nice to have but you don’t want it crowding out the other native plants. And sometimes you get a big reward- the discovery of natives so new to you that you can’t identify them without an app on your phone. In the marsh, where I worked as the weather turned cooler, I noticed quite a few new grasses popping out of the damp soil, especially where the weed torch had been used the prior year. So far, I have identified: Carex albursina, White bear sedge; Carex pedunculata, Longstalk sedge; Carex obnupta, Slough sedge; Carex pennsyvanica, Pennsylvania sedge; Carex frankii, Frank’s sedge; Carex blanda, Eastern woodland sedge; Carex eburnean, Bristleleaf sedge; Danthonia spicata, Poverty oatgrass; Deschampsia cespitosa, Tufted hairgrass; Glyceria striata, Fowl mannagrass and Leersia virginica, Whitegrass. The deer have already helped themselves to a few of these but I am hopeful to see most of them again.

Dee Salomon ‘ungardens’ in Litchfield County.

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