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Controlling Invasive Plants

Category Weeds
Certain plants are so successful in spreading that they can soon take over your garden. This is a guide about controlling invasive plants.
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Solutions

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By 1 found this helpful
July 3, 2011

Herbs become invasive in one of two ways. Some freely scatter their seeds, that seem to sprout with ease even in the most inhospitable conditions. Others send out rhizomes (root-like stems) that meander along just under the soil's surface; sprouting new plants as they go. Both are highly efficient ways to overrun your garden and choke out existing plants. Here are some ways to keep these invasive herbal companions in check.

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Effective Methods of Control

  • Plant them in pots. Individual herbs can be controlled easily by planting them in containers. The containers can then either be left above ground, or you can dig a hole in the garden and sink them into the ground, leaving an inch or two of the pot's rim above the soil line, so the stems won't creep over the edge and root in. A six inch pot with drainage holes is a good size to start with. Herbs in pots sunk into the ground should be dug up and repotted every 2 to 3 years to prevent the plants from becoming root bound.

  • Smother them. Lay down a thick layer of mulch, newspaper, plastic, or landscaping fabric under mature herb plants to discourage seeds from sprouting and to smother young plants.
  • Edge them out. Install plastic edging underground to stop herbs that spread via roots or runners. The edging must be planted fairly deep in the soil (at least 10 inches) or rhizomes will simply burrow underground and pop up a few feet away.
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  • Pinch them back. Stay one step ahead of invasive growth by pinching herbs back vigorously. This will prevent them from producing flowers and casting seed all over the garden.
  • Deadhead them. Remove spent flowers as soon as they wilt to stop invasive plants from reseeding.

Dealing with Escape Artists

If you find that one of the invasive herbs in your garden has managed to escape, dig up the unwanted seedlings, making sure to remove the entire root system. Then sift through the soil with a digging fork to make sure you get any leftover pieces. Keep an eye on the area for several months, and either dig out any plants that reappear or clip them off at soil level and smother them for several weeks with a heavy layer of newspaper or a large, flat stone.

A Short List of Invasive Herbs

The following list of invasive herbs is not meant to be complete. In fact, in your region, the list may be much longer:
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  • artemisia (Artemisia spp.)
  • bee balm (Mondara spp.)
  • chives, garlic (Allium tuberosum)
  • comfrey (Symphytum officianle)
  • costmary (Chrysanthemum balsamita)
  • dandelion (Taraxacum officinale)
  • fennel (Foeniculum vulgare)
  • German chamomile (Matricaria recutita)
  • Herb-Robert (Geranium robertianum)
  • hops (Humulus lupulus)
  • horseradish (Armoracia rusticana)
  • kudzu (Pueraria montana var. lobata)
  • mints (Mentha spp.) (All members of the family, including pennyroyal, peppermint and spearmint)
  • St. John's wort (Hypericum perforatum)
  • tansy (Tanacetum vulgare)
  • violet (Viola ordorata)
  • yarrow (Achillea spp.)

Catalogue Clues: When shopping for herbs in garden catalogs, invasive herbs should come with a warning (mint in particular), but they usually don't, so you'll need to do your homework as well as learn to read between the lines. Plant descriptions such as 'carefree", "vigorous", "establishes quickly", or 'grows anywhere" may be code for invasive tendencies. When acquiring herbs locally, consult other gardeners, local nurseries, and your local extension agent about herbs that are invasive in your area.

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By 0 found this helpful
December 18, 2008

Each year millions of dollars are spent, and tons of herbicides are applied, in what is sometimes a futile attempt to combat the spread of invasive plants. Here is what you need to know about the invasive plant problem and what you can do to help.

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What Makes a Plant Invasive

Plants are classified as invasive when they have proved their ability to thrive and spread (aggressively) outside of their native range. Some plants spread slowly to only small areas and never really become a problem. Other plants are naturally aggressive in their native habitat. When these plants spread to outside their native range, they tend to be equally as aggressive. Before you know it, native plants (and the animals and insects that depend on them) are crowded out and biodiversity is lost. In areas where rare native species are already under pressure, the spread of invasive species can be the straw that breaks the camel's back.

Recognizing Invasive Plants

The 5 Characteristics of Invasive Plants:
  1. They produce a large number of offspring each season.
  2. They can tolerate a variety of soil types and climate conditions.
  3. They spread easily.
  4. The grow rapidly and easily overtake slower growing plants.
  5. They spread aggressively when not constrained by the environmental checks and balances of their native habitat.

How Invasive Plants Spread

Invasive plants spread in a number of ways. Some were imported years ago and have never been fully eradicated. Others are introduced accidentally through agriculture and trade. And some are the result of well-intentioned horticultural practices gone bad (like selective breeding for traits of extreme resiliency).

What You Can Do

Learn to identify plants that are known to be invasive locally. Your local Department of Natural Resources should be able to supply you with information. There are also some great resources online, like http://www.invasive.org

Do your part. As soon as you notice an invasive species on your property remove it. If you see invasive plants in your neighborhood, volunteer to help other property owners remove them.

Choose plants for your landscape wisely. The behavior of a plant can vary widely from region to region. Always check a plant's invasive reputation before adding it to your landscape. What may be loved by one gardener (e.g. trumpet vine, monkey grass) may be a huge headache when planted in your zone.

Consider using native plants or non-invasive alternatives in your landscape.

Comment Was this helpful? Yes

March 3, 2009

Many plants, especially herbs, are very invasive and will spread and quickly take over your garden. To prevent this, place the plant, like this spearmint, in a container. This mint is planted inside an old ice cream maker. I have a beautiful plant and don't have to worry about it taking over!

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By 0 found this helpful
January 9, 2007

When planting a plant that is liable to take over your garden, it is best to get a small plastic bucket and set it into a previously dug hole.

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Questions

Ask a QuestionHere are the questions asked by community members. Read on to see the answers provided by the ThriftyFun community or ask a new question.

By 0 found this helpful
June 15, 2006
Q: I have a problem. I have unfortunately acquired a terribly invasive weed. I have no idea what it is. It looks like a fern, has black pods along it's length, grows in clumps, prefers areas heavily mulched but basically took over large areas of my yard in late winter/early spring. For various reasons I was unable to get out and attack it when it was at its peak. It has now been sprayed and most of it is dead, but not before I'm pretty sure it went to seed, to spend time preparing for the next attack.

I would like to find a practically invasive ground cover to plant in the worst area that might inhibit, or at least challenge, this weed the next time it rears its ugly leaves. It would be great if it was evergreen and shade-loving, but at this point I'll take any suggestions. Does anyone have any ideas as to what I might use? Thanks so much!

Hardiness Zone: 8a

Tripleb from Greenville, AL

A: Tripleb,

Congratulations on getting rid of your very invasive weed. There are several options for ground covers that many people would consider "invasive." Examples include: English ivy, wintercreeper, crownvetch, ajuga, periwinkle, Liriope spicata and certain types of honeysuckle. Of these examples, wintercreeper grows wonderfully in the shade and is highly competitive with under-story plants. Lily-turf is an evergreen that quickly spreads to form a dense mat and can be used to cover a large area. It produces spikes of purple or white flowers, which eventually transform into clusters of black berries. It also provides and interesting texture and grows equally well in sun or shade. It tolerates a wide variety of soil conditions, although it prefers moist, nutrient-rich soil. All of these examples should perform well in your zone.

Good Luck!

Ellen

Answers

May 9, 20060 found this helpful

possibilities: cover the ground with cardboard boxes or black plastic to kill off the weed

plant mint (it's invasive too) or maybe wild strawberries (shade-loving)

I also have a fern problem on occasion, but when I pull them up regularly they don't take over.

Cantate in Zone 8-9

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By guest (Guest Post)
May 10, 20060 found this helpful

I think mint would grow well in the area you have the weeds &/or seeds. It can also be invasive, but it makes a lovely lawn as it smells lovely when walked on ..... is delicious in your kitchen & smells 'cooling' when mown in the summer.

If you don't want to plant mint, find another herb you do like .......
Nothing nicer than a herb lawn & it's practical.

Cheers
Wendy M. from Oz.

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By guest (Guest Post)
May 11, 20060 found this helpful

Sounds like a vetch (coronilla sp.).
Cut the plant down to ground level early spring or as soon as it establishes i.e before the flowers appear then cover with black plastic sheeting and keep covered for at least 3 seasons. Alternately keep it cut back every season until it exhausts itself - we hope.

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May 11, 20060 found this helpful

I live in Pensacola, Florida and I have a plant that would suite your needs...My mother and I call it "the daisy from hell". It grows about a foot a day and can take over an area in about a week. It has a close growing mat of leaves and yellow daisy like flowers. There are some nurserys in our area that actually sell this plant. But beware you must really love it where you plant it because it is near impossible to remove it once in an area. I have been trying to remove it from my garden for the last six years and I am losing the battle!
Request a picture if you are interested and I will post one.
kmcl59

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May 11, 20060 found this helpful

I'd love a picture, kmcl! Thanks to all for the suggestions!

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By 0 found this helpful
May 26, 2007

I purchased a home that was professionally landscaped about 18 years ago but the previous owners did not maintain the beds. A ground cover called "Snow on the Mountain" was used in the largest bed and has taken over. I pulled so much of it out in the fall (including roots) that I thought I'd at least have one spot that was clear but it's back and taking over again! Does anyone have any idea how I can tame this creature? It's a beautiful ground cover so I don't want to kill it entirely but I need to control it.

Hardiness Zone: 5a

Joanne H. from Weare, NH

Answers

May 27, 20070 found this helpful

I have Snow on the Mountain too, and as far as I am concerned, it is an invasive plant.

To get rid of it totally, you need to use "Round Up" repeatedly; it just keeps coming back! I have used a shovel and have dug clumps of it out; pulling it out seems to leave some remnants of the root behind and it just regrows. But, just as fast as I can dig out the clumps, the rest of it grows and refills the area!

I have reclaimed one small area by digging out the plant, filling in the holes with bagged topsoil, covering the spot with black plastic (not the landscape type that has the holes in it) and I covered the plastic with mulched wood chips. So far, there is no "Snow on the Mountain" growing and it is now the second season....I think I may have won the battle!

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By guest (Guest Post)
May 28, 20070 found this helpful

I have Bishop's weed (sometimes confused with Snow on the Mt). This too is an invasive weed. I was told to cover it with black plastic, use rocks to secure it and leave it for 1 year. Check to see if any little sprouts are escaping and pull them. Perhaps combined with Round Up? I do know it is very, very (darn near impossible) to get rid of.

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By 0 found this helpful
August 20, 2011

How do you kill snow on the mountain ground cover?

By CMills

Answers

August 23, 20110 found this helpful

Round up will kill it and the root system, digging it up and giving it to others would be nice but probably wouldn't get rid of root system.

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