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Become a Smarter Gardener in 2019: How to manage Creeping Charlie


Creeping Charlie in bloom
Treating aggressive perennial weeds requires proper timing, an effective product and cultural
practices to help deter re-establishment. Creeping Charlie (Glechoma hederacea) is consistently a problem weed though some homeowners have come to tolerate it because it attracts and provides food for pollinators (one of its few redeeming qualities).

Note: We are bringing back this highly popular blog post from 2016 since we get so many questions about Creeping Charlie at this time of year!

What makes Creeping Charlie so invasive!

Creeping charlie in bloom
Also called ground ivy, creeping charlie is part of the Mint family. Like all mints, it spreads on top of the soil via stolons (surface roots) and will regrow from very small pieces of vegetation left behind in the soil after removal.

It is a very adaptable plant and grows well in moist soil in part shade / full shade sites. Creeping charlie can be found where lawn grass is thin and not very robust. This may be in compacted soils, shady locations, and weedy sites.

Therefore, treating with an appropriate product, maintaining a healthy lawn, utilizing shade tolerant grasses, and choosing alternative ground covers in areas not suitable for growing lawn grasses will help manage weeds including creeping charlie. 

How to discourage it from growing in the first place!

Best cultural practices are recommended to encourage healthy growth and vigor of lawn grasses. Proper selection of grass varieties for the site, fertilization and watering practices that encourage deeply rooted plants are important to a healthy lawn that can out-compete weeds. 

Most lawns are comprised Kentucky bluegrass and perennial ryegrass and require full sun, proper nutrition, and non-compacted soils for optimal growth. A soil test can provide recommendations for soil health and fertilizer.

As shade increases, it becomes less and less favorable for sustaining a lawn in this area, and more favorable for weeds like creeping Charlie. Pruning to increase sunlight and aeration may be options for improving growing conditions; however, if the area is too shady, give up on trying to grow grass in this area and consider planting other ground covers or a shade garden of perennial flowers. 

Herbicide control tips

Creeping charlie and dandelions are
both perennials weeds in turf
Timing of herbicide treatment is key to successful control of perennial weeds like creeping charlie.

As always, read and follow all instructions and guidelines on the label of any product, synthetic or organic, including proper clean up and storage. Note that herbicides are only effective in managing weeds if applied properly. The herbicide label is the law and misuse constitutes illegal application.

Autumn is the best time of year for systemic herbicide applications when creeping charlie is actively taking up nutrients from the soil to sustain the plant through the winter. Spring is a second option when the plant is actively growing.

Some considerations for choosing an herbicide:

  • If you have a large area of creeping charlie or if your lawn is more than 50% creeping charlie, you may want to consider killing off the entire area with glyphosate (the active ingredient in the non-selective herbicide Round-Up®) and re-seeding. Note this product kills all plants including lawn grasses. Depending on the product formula, re-seeding can occur within a few days after application. People and pets may re-enter the area when dry.
  • If you want to treat small areas where creeping charlie is growing in lawn grasses, you can use a a selective herbicide like 2,4-D, Dicamba or triclopyr, or combinations of these products. Triclopyr will be the most effective option for creeping Charlie. These are systemic, selective broadleaf herbicides. They are taken up by the plant and kill the entire plant from roots to flowers. Note they do not kill lawn grasses if applied properly. These products are effective and usually require only 2-3 applications per year depending on proper use and timing.
  • Chelated iron burns creeping charlie foliage and its stolons. A maximum of four applications may be applied annually. Lawn grasses may show some burning on the blades, but will recover. They also will turn a deep green due to the absorption of iron. Because of this, chelated iron should not be used for spot treatments as it will result in deep green spots throughout the lawn. Treated areas may be re-seeded the next day, and people and pets may re-enter the area when dry. Note that chelated iron can be expensive, and may stain equipment, sidewalks, driveways, etc. Here is a publication from the University of Maryland with more information

The facts about Borax 

In the past, borax (boron) was a product recommended for eradicating creeping charlie. However, research has shown that the addition of boron to soil, even in very small amounts, can create an unfavorable growing environment, and make it difficult to re-establish lawn grass. Also, this is an illegal application.  Any product used in this fashion must be specifically labeled for the weed you are trying to control.  Therefore, borax it is no longer recommended for eradication of creeping charlie.

Going forward, regular and well-timed cultural lawn care practices will help keep weeds like creeping charlie managed and turfgrass healthy.

The Upper Midwest Lawn Care calendar is a good tool for helping time applications of fertilizer and pre and post-emergent herbicides and when to perform tasks like aeration to reduce compaction.

For more on healthy lawns: http://www.extension.umn.edu/garden/yard-garden/

Round-Up® is a trademark of Monsanto Corporation.

Authors: Julie Weisenhorn and Sam Bauer, Extension educators

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Comments

Maureen said…
Living up against one of the Mississippi River bluffs, with my "yard"in the shade I have embarrassed Creeping Charlie and also the woodland violets. This can be mowed two to three times a year, and is sustainable versus massive use of herbicide. Are we not trying to grow beyond the perfect turf lawn?
bshaw said…
Is there any grass or groundcover that will crowd out Creeping Charlie? Will clover? I really don't want to use any herbicide
Nutella Crepe said…
No -- cc has overtaken clover, violets, everything. I wish people know how bad it is. I read some comments where people buy it and plant it on purpose. They're nuts!
NZ MBEA said…
We all need to be better stewards of our planet and the use of glyphosate (and other legal chemicals) is clearly detrimental--whether used according to directions or not. It indirectly Even though it is legal in the U.S. it is important to recognize these facts. To even present it as an "option" is to tacitly approve of it's use. I would hope that our own U of MN (of which I am a Medical School graduate of) would stand on the side of science, and on the side of the future of our planet. Thanks for the info on the chelated iron though--it worked!
Nita said…
Glyphosate is inherently detrimental to human and wildlife health. It poisons more than weeds and we should not contribute to Monsanto/Bayer to to produce a product that is known to cause cancer. It has been banned in the Europe for good reason.
Tramps said…
To NZ MBEA:
I too am a graduate of the U o MN - in Chemistry. I'm sure The School of Agriculture is well aware of the issues with glyphosate. Perhaps you've been watching too many of the TV ads by money-hungry lawyers sponsoring class-action lawsuits. Please take them with a grain of salt. When used with the proper precautions, glyphosate will not harm you, and it breaks down.
Rick Johnson said…
Have to use roundup and replant.Untill there is a granular specific to creeping Charlie.
24D With Ester works good if you dont want to replant.Been using roundup since it came out.Farmers will not survive without it.
Rick Johnson
Rick Johnson said…
We all need to be good stewards. Follow use guidelines on product then there are no issues. For the creeping Charlie. I have none in the 2 acres that looks better than a golf course. If there is a bunch if cc then use roundup and reseed with proper seeds for where you live. If you dont want to reseed a really good way is 24D Ester.This process will give you a great lawn and no effect to anybody,if used according to the directions
LauraLove said…
I was more than happy to uncover this great site. I need to to thank you for your time due to this fantastic read!! I definitely enjoyed every bit of it and I have you bookmarked to see new information on your blog.
Unknown said…
Rick Johnson, if you only use roundup you will potentially create a Roundup resistance. It is always a good idea to use two modes of action, ie two products to eradicate a weed in different ways. Purdue University has some good resources to see how different herbicides work and you can apply those principles to your problem. However, always verify before mixing anything and check with your states Extension agents for more help.
Bob H said…
Hi! I am wondering if we can put a five inch plastic bed divider between a planter bed and our neighbors creeping charlie lawn, and if we then had a bed with hostas or what not in it, if that would be sufficient to keep our neighbor's creeping charlie on their lawn and keep it out of ours. Thanks for any ideas.
Bob H said…
Hi! Our neighbor's lawn is all Creeping Charlie. We are thinking of putting a bed a few feet wide with hostas in it. If we put a five inch deep plastic bed divider on the shared side of the bed, do people think that would be enough to keep their creeping charlie over by them? Thanks!
Steve said…
I have a wooded hillside with some Spruce and Fir trees, can I use a herbicide to combat Creeping Charlie that won’t harm the trees?
Editor, AFNR said…
The best thing to do next is to ask a Master Gardener volunteer: https://extension.umn.edu/master-gardener/ask-master-gardener Thank you for your comment and best of luck!