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Invasive Garden Plants

Updated on April 23, 2016
Gloriousconfusion profile image

I love gardening, garden design, learning gardening techniques and photographing plants. I was a member of the Royal Horticultural Society.

Plants Which are Attractive but Spread Rampantly toTake Over Your Garden

I first came across the phenomenon of invasive plants many years ago when I inherited a garden which had very little in it except Snow-in-Summer and Grass in the back garden, and Heuchera (London Pride), a Dog Rose and Grass in the front garden.

All attractive plants, thought I, but the garden looked a little empty and needed more variety.

In the end, I had to dig out all the Snow-in-Summer, as it spread all over my rockery. I left the Rose Bush to flourish as I couldn't bear to cut it down, and the Heuchera, I wish I hadn't cut it back so vigorously, as it barely recovered.

Heuchera - London Pride

Source

A Word of Advice:

Of course, it's important to remember that just because you have invasive plants - rampant growers - it doesn't mean that you need to ban them from your garden design. Just keep an eye on them, and control them, cutting back, uprooting, clipping, and whatever is appropriate to stop them taking over. Many invasive plants are very beautiful, but you need to let them know that you're the master.

Fifty-five Years Later, Amazingly, I Still Have the Dog Rose and Heuchera

These particular plants were not in fact invasive, but just vigorous growers in the right conditions, and they certainly have strength and fortitude.

I bought a few rockery plants over the next year or two, and the rockery looked quite appealing. The white flowers of snow-in-summer bloomed from about April to June, and the small fluffy textured silver-grey leaves were the perfect foil, even if the whole lot did look a bit straggly in summer. Gradually the innocuous-looking plants carpeted the whole rockery and the other rockery plants were subsumed and, one by one, disappeared. I was reluctant to cut them back because they were so beautiful. I would pull out bits here and there, and leave the rest. But in the end I dug the whole lot out...and then I was sorry.

Snow-in-summer

Source

Snow-in-Summer (Cerastium), Mouse-Ear Chickweed, Silver Carpet - Above is a close-up showing the dainty white flowers and silvery grey leaves

This is a Perennial which tolerates drought and will grow in dry to moist soils. It prefers well-drained, loamy or sandy soil and requires full sun. It is grown as ground cover with a height of 6-8".It bears masses of small white flowers which bloom in early summer, May and June, above the dense mat of silvery grey foliage.

Trim plant back after flowering to keep it neat and compact.

Invasive = Easy to Grow

Don't be frightened off by

learning that a plant is

invasive - it can still be

a good plant for beginners.

Just be very strict and dig out

what you don't need

Montbretia - biological name Crocosmia -

Montbretia (Crocosmia)
Montbretia (Crocosmia) | Source

The flowers of Montbretia grow in delicate racemes of rich golden orange or flame colour

These are deciduous perennials which flower on an arched spike from early summer until autumn. This long-flowering season and satisfying flame colours makes them good value in my eyes, regardless of their bad behaviour. The long leaves are very attractive in spring, but after flowering they flatten and die back and can make the flower border look a bit of a mess if not cut back. They grow from basal underground corms . The corms are unusual in forming vertical chains with the youngest at the top and oldest and largest buried most deeply in the soil. The roots of the lowermost corm in a chain are contractile roots and drag the corm deeper into the ground where conditions allow. The chains of corms are easily separated, which enables them to become invasive and difficult to control in the garden.

Although they are natives of South Africa, Crocosmia are still winter-hardy in more temperate regions and flourish in full sun or partial shade

They are easy to propagate by division, removing offsets from the corm in spring: each corm will grow into a separate plant and they need to be planted in clumps.

They grow to about 1 - 2 ft high.

All the Plants Shown on This Page Grow Rampantly

They look innocent but in their true colors

they are greedy land grabbers

I know, because I've grown them all.

The secret is to keep an eye on them, and dig out the plants you don't need before they take over the whole flower border in your garden

Euphorbia

Euphorbia
Euphorbia | Source

There are many varieties lof Euphorbia, some invasive growers, some not so rampant

The buds start showing above ground in early spring, and gradually unfurl to show delicate yellowy green flowers with slightly darker yellow-green leaves which last through spring, summer and autumn - is that good value or what?. These perennials spread slowly, over a number of years, so you may not immediately notice the take-over. Just keep them under control, grubbing out the surplus, and you will have valuable plants, about 8 - 12 inches high which are very attractive and because of their modest colouring, they are a good foil to other plants.

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Periwinkle - Vinca Minor

Source

Periwinkle with small flowers is called Vinca Minor, and the larger variety is called Vinca Major

Evergreen low-growing perennials which flourish in sun or shade, even under trees, so they are particularly good ground-cover. They have appealing mauve flowers in spring, and then sporadically throughout summer and autumn. In drought conditions be sure to water them. They spread by a network of small roots which grow out of the stems as they creep along the ground. They are about 3 - 6 inches high.

Take care, because they are very invasive if they like their position, and win any battle where they are in competition with other plants. They are so lovely, with their shiny dark green leaves and little flowers winking at you, that I always feel reluctant to dig them out and cut them back, but you don't want a whole garden with nothing but periwinkle in it, do you?

Just be strict, make a decision where you want them, and don't let them spread beyond that.

Don't Worry, you don't need to Eliminate these plants altogether

They are beautiful and well-worth growing, even if they are rampant and invasive - just make sure you keep them under control

Weigelia

Weigelia
Weigelia | Source

Weigelia is a large shrub, reaching about 10 feet high

Weigelia is a deciduous shrub. It flowers for a short time in spring and then does nothing much for the rest of the year except that it looks quite pleasant and green.

I grew one plant at the back of my garden, and it spread so much that it now occupies an area of about 50 square feet in the golf course just beyond my back garden, and still spreading, so I cut it back every year. But still worth keeping.

Anemone Japonica

Anemone Japonica
Anemone Japonica | Source

Anemone Japonica - one of my favourite flowers - shapely beautiful leaves and delicate pink or white flowers in autumn

Anemone Japonica always looks good - the new leaves start to develop in mid Spring and grow into a crescendo of large ornamental leaves and heads of flowers in late summer. When they die back, the woody flower stems can be cut and removed, leaving the leaves which remain ornamental. They spread by strong underground roots and you need to make sure you have dug out completely the bits you don't want, as it doesn't take much to get them spreading again. But keep them under control and you have a magnificent perennial with a long flowering season.

Borage - Another Beautiful but Invasive Plant Which Seeds Itself Copiously

Borage
Borage | Source

Forget-me-Nots - Rampant Self-Seeders but Easy to Clear

Source

My Flower Designs on Zazzle

You can have these floral designs on lots of different Zazzle products, not just what you see here

Below is White Osteosperm Note Card

by GloriousConfusion

A Note Card and a Mug I designed on Zazzle - you can buy them by following the links:

This Hollyhock design comes on a number of different products:

Take a Look on Zazzle by Following the Link Below:

Red Hollyhocks Mugs

by GloriousConfusion

Take the Poll Below About Invasive Garden Plants - See how you compare with other voters

Invasive garden plants can be hard work to control.

But would you really want to dig them out completely, if they bear beautiful flowers, like borage in the picture above?

Would you tolerate invasive species in your garden?

See results

Do Comment in my Guestbook - I like to know you are there and love hearing from people. Maybe you can add to the list of plants, or talk about your experiences

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    • justholidays profile image

      justholidays 7 years ago

      Really interesting lens that relates to gardening; which is one of my many passions!

      Dom.

    • Stazjia profile image

      Carol Fisher 7 years ago from Warminster, Wiltshire, UK

      Very interesting and informative lens - I never knew about Crocosmia corms going deeper into the soil, fascinating. Lensrolled.

    • greenspirit profile image

      poppy mercer 7 years ago from London

      I fell in love with the green stripey grass Phalaris arundinacea...ha ha. It does look so fresh, cool and beautiful with white flowers and ferns, but now it lives under my paths and pops up everywhere. I still love it, but would never plant it in a small garden.

    • PromptWriter profile image

      Moe Wood 7 years ago from Eastern Ontario

      I have the Vinca Minor and it does spread if you don't keep an eye on it. It is definitely not for neat gardens but would be a great filler ground for a large area. Another one I've had a problem but I can't remember the name off the top of my head. I'll have to check the tag when I go out.

    • Lee Hansen profile image

      Lee Hansen 7 years ago from Vermont

      In our climate nearly every plant can become invasive. We try to plant with this in mind, using fast spreaders in areas that need cover and welcome it. We're using periwinkle under a tulip tree where grass refuses to grow. It's been a great solution to stop erosion. Nicely done lens, with many excellent plant tips that I plan to try.

    • profile image

      anonymous 6 years ago

      Strawberry: Lipstick- sm pink flower, does bear fruit

      Very INVASIVE- 2 plants took over a 20x30 area , round-up to the rescue, now round 2.

    • profile image

      anonymous 6 years ago

      Fantastic gardening information, thank you. When we moved here 20 years ago, I planted crownvetch in one ditch (we have two). I planted this for erosion control and to make it look nicer, they have little purple flowers and low growing. Little did I know it would completely take over both ditches, into our neighbours ditch and started to come up onto our lawn. I didn't realize it had become invasive speciies here. Fortunately we have new roads and ditches going in and dug out all the ditches and replaced with rocks. - Kathy

    • capriliz lm profile image

      capriliz lm 6 years ago

      I had a plant that started growing this past summer near the neighbor's garage. I thought it had such pretty flowers. Before I knew it, the stems had become quite woody, and the plant had taken over the entire area! I think it was one of the invasive plants! Very nicely done!

    • junecampbell profile image

      June Campbell 6 years ago from North Vancouver, BC, Canada

      To a certain extent, a plant's invasiveness depends upon where you live and the circumstances. I once let several dill plants go to seed in my vegetable garden. Talk about invastive! I thought I'd be pulling up dill forever. On a similar note, when I lived in the Canadian prairies, morning glory was a desired plant that we cultivated as a flower. After moving to Vancouver, I discovered that out here it is considered an invasive weed and people do their best to rid themselves of it. Great lens, but the way. Enjoy your retirement. I am in the same boat. I work when I feel like it. Life is good. LOL

    • MBradley McCauley profile image

      MBradley McCauley 6 years ago

      Added this fabulous, extra informative lens to my Pot Gardens are Easy lens. You have a fantastic lens-ability.

    • Kevin Wilson 2 profile image

      Kevin Wilson 2 5 years ago

      I have only one thing to say: Japanese Knotweed. It's in my neighbour's gardens to left, right and over the back and I fight a running battle with it every year.

    • poissonenciel profile image

      poissonenciel 5 years ago

      Nice! Thank you

    • Frischy profile image

      Frischy 4 years ago from Kentucky, USA

      Creeping charlie, vinca, mulberry trees. I am sure there are some others, but these are the most invasive plants in my yard. They really give me headaches!

    • Gloriousconfusion profile image
      Author

      Diana Grant 4 years ago from United Kingdom

      @Frischy: I hadn't heard of creeping Charlie before, so checked and found it is also known as also known as ground ivy and creeping jenny, and I do recognize the pictures.

    • MizzMary profile image

      MizzMary 4 years ago

      Stray hollyhocks are popping up all down my street and they originate from one yard. This is kind of funny because the people just bought that house and the flowers have taken up their whole front yard. I'm sure they don't know what's happening. They mow them down religiously, but guess what? The hollyhocks don't give up that easily! I should go ask them I can dig them up for them and bring them on home because they are one of my top ten favorite flowers and I don't have any yet. Great lens by the way!

    • Gloriousconfusion profile image
      Author

      Diana Grant 4 years ago from United Kingdom

      @MizzMary: I tried unsuccessfully for years to grow hollyhocks, but eventually they did take, growing exactly where I wanted them, in colors of my choice, and look lovely - see my Squidoo webpage called Red Hollyhocks

    • Grasmere Sue profile image

      Sue Dixon 4 years ago from Grasmere, Cumbria, UK

      My parents who had the house before us planted gaultheria. Flower arrangers love it, and it can be pretty, but it comes up everywhere and is so tough! Lovely lens. Blessed!

    • Vikk Simmons profile image

      'Vikk Simmons 4 years ago from Houston

      Lantana is a big land grabber here. Enjoyed my read.

    • SusanDeppner profile image

      Susan Deppner 4 years ago from Arkansas USA

      These invasive plants really are gorgeous. I can see how they could easily get out of control. Thanks for the warning!

    • Elsie Hagley profile image

      Elsie Hagley 4 years ago from New Zealand

      Nice photos. I enjoyed wandering through your plants.

      Love gardening, have just about got on top of the plants that invade my garden, but you have to keep knocking them back, if you don't they will win in the end.

    • Gloriousconfusion profile image
      Author

      Diana Grant 4 years ago from United Kingdom

      @Elsie Hagley: Yes, it's hard work. And also it really tears my heartstrings to have to dig out beautiful plants which I love! I'm just about to dig out an invasion of forget-me-nots in my vegetable patch (but I think I'll wait till most of them have flowered).

    • Gloriousconfusion profile image
      Author

      Diana Grant 4 years ago from United Kingdom

      @SusanDeppner: Probably best to do it earlier rather than later - a stitch in time saves nine, as they say

    • Cynthia Haltom profile image

      Cynthia Haltom 3 years ago from Diamondhead

      I didn't know some of these plants were invasive. Living in Mississippi everything seems to grow and rake over the yard and the garden.

    • Gloriousconfusion profile image
      Author

      Diana Grant 3 years ago from United Kingdom

      @Cynthia Haltom: It's hard work, isn't it!

    • RaintreeAnnie profile image

      RaintreeAnnie 3 years ago from UK

      I do like snow in summer even though it is invasive, it doesn't do so well here as we have very heavy clay so its not so bad! We did have an issue with periwinkle a few years ago and in the end decided to dig most of it out leaving a tiny patch which I watch like a hawk LOL!! Love your gardening pages :)

    • Gloriousconfusion profile image
      Author

      Diana Grant 3 years ago from United Kingdom

      @RaintreeAnnie: We have heavy clay in London too - best way to break it down is to mix a bit of sharp sand in it every year. Although my garden was indeed smothered in snow-in-summer for years and I dug it up, I am now thinking of planting some more, because it is so pretty, and has such a long flowering period - what I call a "good value" plant

    • Virginia Allain profile image

      Virginia Allain 3 years ago from Central Florida

      I have a ground cover, that is a light green with white trim. It's called snow on the mountain. I don't mind it sending runners everywhere as it looks so pretty. The ones that escape the flower bed, I just pull up and put them in an area I want to fill.

    • Gloriousconfusion profile image
      Author

      Diana Grant 3 years ago from United Kingdom

      I just keep digging them up, and giving them away to neighbours and people on Freecycle, with a suitable warning about invasiveness. Do any of you use your local Freecycle? It's brilliant for giving away and receiving other people's unwanted things. Yesterday I gave away a Castor Oil Tree, some Japanese Anemones and some Crocosmia (Montbretia), and in the last month I have received a book case and some sand.

    • profile image

      GrammieOlivia 3 years ago

      Great lens on some over exubirant plant material! The one I dislike with a passion is goutweed! I shy away from anything that has "weed" as part of it's name!

    • OhMe profile image

      Nancy Tate Hellams 3 years ago from Pendleton, SC

      I really have Spring Fever and am so ready to see some blooms in the garden. Enjoyed this page. Thanks.

    • Gloriousconfusion profile image
      Author

      Diana Grant 3 years ago from United Kingdom

      @OhMe: Yes. my first daffodils are out

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