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How to Stop Invasive Herbs from Spreading

Food Gardening Magazine: Herb Gardening Made Easy Special Issue

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How to Stop Invasive Herbs from Spreading

Are invasive herbs taking over your garden? Find out what you can do to keep them contained.

By Amanda MacArthur

Invasive herbs? I know that’s not how I usually think of invasive species. When I think of invasive species, it’s usually things like boa constrictors in the Everglades, carp in the Great Lakes, or perhaps kudzu in the southeastern U.S. Or murder hornets. Murder hornets are definitely invasive. 

As it turns out, though, some herbs can be pretty darn invasive. The Invasive Plant Atlas of the United States lists more than 800 herbaceous plants they consider invasive. This list includes a number of ferns, flowers, grasses, and other plants that don’t fall into the culinary herb category. However, they also list things like fennel and lemon balm. 

Let’s make things easy on ourselves, though. For our purposes here, I’m considering invasive herbs to be those that seem to have growing superpowers and will take over your garden if you aren’t diligent. 

Flowering chive plants

Slowing the spread of invasive herbs in your vegetable garden

First, let me say that I love having some of these invasive herbs in my garden. My mint comes up reliably every year, no matter how much I neglect it or how cold it gets here in New England. Honestly, if single-digit temperatures and drought don’t kill it, I don’t know what would. 

I also love having mint around to make tea, use in various recipes, and even as part of a bouquet to bring an energetic aroma into a room. 

Chives are another excellent example. They deter numerous pests, they’re fabulous in the kitchen, and when they flower, they attract pollinators. I could go on about the many reasons these invasive herbs deserve a spot in the garden, but you get the idea. 

As much as I love them, I still want some space in the garden for tomatoes and peas and squash and whatever else I want to grow. So how do we find a balance? Is there a good way for these herbs and the rest of your garden to coexist peacefully? Yes, it just takes a little work on your part. 

Most of these invasive herbs spread in one of two ways. They either send out runners, or they produce seeds that spread easily and thrive. Those that spread through re-seeding can be a little more challenging to control since wind and rain can both help spread the seeds around. 

You have a few options here, but your best chance of containing these herbs is to deadhead them the moment the flowers start to dry and go to seed. You could even pinch off the flowers when they first appear, though that does deprive you and your pollinator friends of their benefits. 

Another option is mulching. A thick layer of mulch around your herbs can help prevent seeds from sprouting and growing. And if despite your best efforts, you find that herbs are spreading and taking up too much space, you can always pull them just like you would any weeds. 

Herbs like mint, oregano, and thyme that send out runners are somewhat easier to contend with. In many cases, a good barrier will help contain these invasive herbs. They thrive in containers, so that’s certainly a good option. Just be aware that you may need to repot them somewhat regularly. 

Another option for herbs in the ground or a raised bed is to place physical barriers into the soil around them. Metal or plastic edging will work, but you need to get these reasonably deep into the ground. I’ve seen some sources that suggest 10 to 12 inches, or the runners will dig down until they can escape. 

Of course, you can also try to catch them and dig them up whenever they pop up, but at that point, you’re behind the curve. I’m not saying it’s impossible, but you will need to work harder. 

One last suggestion in case you do have invasive herbs that are taking over your garden. If you haven’t found any other way to keep them in check, you could always just live with them and make a whole lot of custom-blended tea for your friends and neighbors!

Have you found a good way to prevent fast-growing herbs from taking over your garden? Let me know in the comments. 

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Tags

chives, fennel, invasive herbs, mint, peas, thyme, tomatoes, vegetable garden

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TABLE OF CONTENTS

  • Gardener’s Notebook

  • Herb’s the Word With This Special Edition
  • Spices vs. Herbs: An Introduction to Growing Your Own
  • Planting an Herb Garden: From Seed to Seasoning
  • 10 of the Best Savory Herbs to Grow for Family Meals
  • How to Grow Herbs For Tea in Your Kitchen
  • How to Create a Living Wall Herb Garden Inside Your Home
  • How to Grow Herbs in Mason Jars
  • How to Stop Invasive Herbs from Spreading
  • How to Bring Dying Herbs Back to Life
  • How to Propagate Rosemary and Other Herbs Indoors
  • Crafting Charming Herb Stakes for Your Garden: A DIY Guide
  • How to Transplant Herbs into Indoor Pots for the Winter
  • Growing Edible Flowers and Herbs in Winter
  • How to Dry Herbs
  • How to Harvest Fresh Herbs in the Fall to Use All Winter

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