Seemed Like a Good Idea at the Time

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Around 1979, while a senior studying horticulture at the University of Tennessee, I transplanted several small winged euonymus (Euonymus alatus) plants into my parent’s landscape just outside Bristol, Tn. Mom is still living at the same place, and I’ve had the chance to watch a single landscape evolve for 40 years and counting. Some of the evolution is a little unsettling, in particular the steady advance of the winged euonymus.

At least late as the early 1990s, winged euonymus, also known as burning bush, was widely considered to be “still one of the finest plants for American gardens” (Manual of Woody Landscape Plants, Michael Dirr, 1990 edition). It was noted for its fine foliage, outstanding red fall color, general toughness, rate of growth, and other attributes. Gradually it became evident that this non-native was performing a little too well in some places. Today, the NC Extension Gardener Plant Tool Box, Missouri Botanical Garden and other sources tell us that the species has naturalized in at least 21 eastern and midwestern states, and in some areas is considered to be a threat to native plants. In addition, the NC Native Plant Society now ranks it as a “significant threat” to native plant communities in the state.

Winged euonymus doesn’t seem to be quite as well adapted to the heat and humidity of Eastern NC, and during my 32 years in this area I haven’t encountered naturalized stands. But it certainly thrives and has become an issue in other parts of the state.

On the property in Bristol, there’s no question that dense stands have formed over the years, and that young seedlings carpet the ground to the extent that nothing else can be seen there – with the exception of a few equally problematic Japanese stiltgrass (Microstegium vimineum) seedlings joining in. In addition, I can find numerous individual plants scattered in nearby open woods, all of which have the potential to start up their own small cities. It looks like the old place needs some work – whenever I can get to it.

winged stem

Close up of winged stem. This individual may or may not have originated from the cultivar ‘Compactus’. Wings are said to be more prominent on the species as compared to the cultivar, but this can be a subtle difference, and certainly doesn’t appear to be relevant in terms of invasiveness.

seedlings

Where the sun can reach, nothing but euonymus seedlings; underneath the mothership, nothing else growing.

Japanese stiltgrass

Japanese stiltgrass finds a foothold in the winged euonymus.