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Vinca major #867389

Asked May 07, 2024, 10:35 AM EDT

Hi, wondering if someone can guide me how to get rid of vinca major. It's taking over!

Charles County Maryland

Expert Response

Yes, this is an invasive species in Maryland, unfortunately, like its more widely-planted cousin Vinca minor. As with any perennial weed, your options are physical removal or chemical removal. Physical removal entails either digging the plants up or covering them with a light-blocking tarp to starve them of sunlight. The latter technique might not work very well for a creeping plant, though, since it may just find its way outside of the tarp edges. The goal of smothering is to deny weeds light for long enough that they run out of root energy stores, though it's hard to predict how long that will take with vigorous, aggressive plants like Vinca.

Chemical options center around systemic herbicide use, which is absorbed by the plant (through foliage, in this case) and moved into roots where it kills the whole plant. Even so, more than one application might be needed before treatment is successful, and these kinds of usage directions (like how long to wait between sprays) will be on the product label. Note that these kinds of herbicides tend to be non-selective, so may injure or kill any other plant contacted by the spray, so make applications carefully.

Vinca has waxy, water-repellent leaves, so the addition of a surfactant (sometimes called a spreader-sticker) may be needed. These are additives to pesticides that help them function, and in this case, would help a liquid spray adhere to the leaves for long enough to be absorbed. They are sold alongside pesticides in garden centers and will have their own usage instructions on the label. Check the herbicide label to make certain it allows for the addition of a surfactant/spreader-sticker, since some formulations might already contain one.

Miri

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