Invasive Mint: How to Kill Mint Plants

Mint is a popular herb that adds a refreshing flavor and aroma to dishes, beverages, and even beauty products. However, despite its many benefits, mint can also become invasive and take over gardens, lawns, and other areas where it's planted. If left unchecked, mint can spread rapidly and choke out other plants, becoming a nuisance to homeowners and gardeners alike.

The Problem with Invasive Mint

When mint plants are allowed to grow unchecked, they can quickly take over an area and become difficult to control. Mint spreads via underground runners called rhizomes, which can grow several feet in all directions and produce new plants. This means that even if you try to pull up or cut back the mint, it will often come back stronger than ever.

In addition to being a nuisance, invasive mint can also be harmful to other plants in your garden. As it competes for nutrients and space, it can choke out other plants and prevent them from growing properly. It can also attract pests like aphids and spider mites, which can damage surrounding plants.

How to Identify Invasive Mint

Before you can tackle the problem of invasive mint, it's important to be able to identify it. Mint leaves are usually bright green and have a distinctive scent when crushed. They are often oval-shaped and have serrated edges. Mint flowers are typically small and white or purple.

If you're not sure whether a plant is mint or not, you can always do a quick "smell test" by crushing a leaf between your fingers and smelling it. If it smells like mint, then it's likely a mint plant.

Ways to Control Invasive Mint

If you're dealing with invasive mint, there are several methods you can use to control it:

Hand Pulling

One way to control mint is to simply pull it up by hand. This method works best for small patches of mint or for isolated plants. To pull up mint, grasp the stem at the base and gently but firmly pull upward. Try to get as much of the root system as possible, as this will help prevent regrowth.

Cutting Back

If you have a larger patch of mint to deal with, cutting it back can be an effective method of control. Use a pair of sharp scissors or shears to cut the mint down to just a few inches above the ground. Be sure to dispose of the cuttings carefully, as they can still sprout new growth if left on the ground.

Smothering

If you want to kill off a large patch of mint without using chemical herbicides, you can try smothering it. Cover the mint with a thick layer of cardboard or newspaper, followed by a layer of mulch. This will deprive the mint of sunlight and prevent it from growing. You'll need to leave the covering in place for several weeks to ensure that all the mint is dead.

Using Herbicides

If all else fails, you can use herbicides to kill off invasive mint. Look for a herbicide that contains glyphosate, as this is effective against mint. Follow the instructions carefully, and make sure to wear protective clothing and gloves when applying the herbicide. Keep in mind that herbicides can also harm other plants, so use them with caution.

Preventing Invasive Mint

The best way to deal with invasive mint is to prevent it from taking over in the first place. Here are some tips to help keep your mint under control:

Plant Mint in Containers

One easy way to keep mint under control is to plant it in containers rather than directly in the ground. This will prevent the mint from spreading via rhizomes and allow you to control its growth more easily.

Trim Regularly

Regularly trimming your mint can help prevent it from getting out of control. Aim to trim it back by about a third every three to four weeks during the growing season.

Remove Flowers

Mint flowers may be pretty, but they also signal that the plant is going to seed. Removing the flowers before they have a chance to set seed can help prevent the mint from spreading.

Use Barriers

You can also use physical barriers like plastic or metal edging to prevent mint from spreading into other areas of your garden. Dig a trench around the mint and insert the barrier material, ensuring that it goes several inches below the surface to prevent rhizomes from growing under it.

Invasive mint plant taking over a garden

Invasive mint can be a real problem for homeowners and gardeners, but it's not impossible to control. With a little effort and some careful planning, you can keep your mint under control and prevent it from becoming a nuisance. Whether you choose to hand pull, cut back, smother, or use herbicides to control the mint, it's important to be consistent and persistent in your efforts. And if all else fails, remember that planting your mint in containers can be a simple and effective solution!

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