Perennials are a fantastic, low maintenance investment for flower gardeners. Plant them once and they’ll return year after year. However, some perennials are a little too good at their job and can quickly take over your flowerbed and crawl into your lawn. What you thought was a low maintenance plant can quickly become your worst nightmare.
Last year I published a post on the 28 Perennials You’ll Regret Planting in Zone 2 and Zone 3. I never dreamed it would get the kind of response it did as people are passionate about perennials that seem like a good idea and quickly become more than a new gardener can handle.
I’ve compiled a list of readers suggestions of perennials, vines, and a few self-seeding annuals that can quickly get out of control. Please remember that I have not planted most of these and am using the experiences and suggestions of others.
What is an invasive perennial in one area, might not even be possible to grow in another. When in doubt, google your Province or State plus the term “list of invasive plants.”
Finally, one man’s invasive perennial is another man’s favourite flower. If you love it, plant it. Don’t let some gardening-blogger-on-the-internet stop you. 😉
One man's invasive perennial is another man's favourite flower.Click To TweetVines of Misery
Sure, these vines may look beautiful, but they can strip paint when removed, clog your gutters, take over trees, and even survive salted ground and dog pee.
Bittersweet Nightshade Vine
Clematis
Seems to be a trend with purple flowering plants. . .
Hops
I can personally attest to the ferociousness of this vine. During a good growing year it would climb the entire height of our antenna!! I can only imagine what it would do in an area warmer than zone 3.
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Ivy and English Ivy
Stories of terror include peeling paint of a house and surviving both salt and dog pee.
Passionflower Vine
This vine is super invasive in Texas–a place where most of the flowers on my previous list are impossible to grow. Think about that for a moment.
Puncture Vine
Don’t let those sweet yellow flowers fool you.
Sweet Potato Vines
Where I live in Zone 3 it is very difficult almost impossible to grow sweet potatoes and their vines are not a problem. However, if you live in a very warm zone like 8 or 9–beware!
Sweet Autumn Clematis
Yes, the multitude of white blooms are gorgeous, but require a lot of maintenance to keep under control.
Vinica Minor/Small Periwinkle
Thank your lucky stars if you live in a colder area of North America, because it won’t be invasive for you.
Vinica Major/Periwinkle
Same as above, only with larger blooms.
Wisteria
Sure, they look gorgeous, but this vine is not for the low maintenance gardener. More than one reader has tales of an unchecked Wisteria vine destroying pergolas and climbing into neighbouring trees within 5 years.
So what vines are good to plant? One reader suggests star jasmine, pink jasmine, banks rose and tangerine beauty.
Related: 53 Favourite Perennials You Need to Plant Now
Herbs Gone Wild
Oregano
Chives
I personally love chives, so I’m okay with them growing a lot. It’s a joy to be able to share some with friends. If you want to stop your chive plant from growing, remove all the purple flowers before they go to seed.
Creeping Thyme
Any plant that has the word “creeping” in its name is bound to be a problem.
Feverfew
Feverfew looks like a daisy and it’s medicinal use is primarily for headaches and migraines.
Herbs with the name Mint in them
Chocolate Mint, Mojito Mint, Spearmint, you name it. If it has the word mint in it, plant it in a pot unless you want it to take over your lawn.
St. John’s Wort
Fun fact–the name of the plant comes from it’s usual blooming time of around June 24th, the feast of St. John. It’s also used for many medicinal purposes. Not so fun fact–it will grow everywhere in short order.
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Self-Seeding Annual Flowers
Four-O-Clocks/Mirabilis
Mirabilis means wonderful in Latin. These flowers are wonderful to look at, but horrible for self-seeding themselves everywhere.
Gazania
Torenia/Wishbone Flower/Crown Flower
Unfortunately I couldn’t find any stock photos of this flower, so head over to the Spruce to see a picture.
Related: The Best Flowers to Grow for a Cut Flower Garden all Summer Long
If it has Weed in the name. . .
You really should know better, right? Here’s a couple of offenders:
Bindweed and Morning Glory
Bugleweed/Ajuga
I grew up all my life referring to this plant as “Pilgerweed” because my Dad got this plant from a friend in Pilger and it invaded a good portion of our lawn on the farm. No small feat when your lawn takes 4 hours to mow on a riding mower.
To be fair, I actually kind of like this one. The purple flowers really cheer up my weedy lawn.
Japanese Knotweed
Beware the Birdseed
If your bird feeder is over your lawn, either invest in good quality seed that doesn’t contain alfalfa as a filler, or put your bird feeder over a location with cement on the ground. If you don’t, you could end up with some unexpected surprises.
Perennial Flowers You’ll Regret Planting
Bouncing Betty/Soapwort
Bouncing Betty gets its cute name from an early pioneer who left cuttings of soapwort as she travelled across America. Soapwort was used as a natural laundry soap, so she was doing all the future families who would arrive in her location a huge favour. Now? Maybe not so much.
Chameleon Plant
The chameleon plant can be green with white flowers as shown, or more commonly, with red rimmed and green centred leaves. They’re very pretty, but can quickly take over a yard.
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Columbine
Columbine isn’t a problem where I live, but it is a self seeder and can really go to town in warmer climates.
Crocosmia
I laughed out loud when I researched this plant and the first variety I stumbled upon was called Lucifer. Make of that what you will.
Crown Vetch
Helpful for stopping erosion, but not so helpful in your flower bed.
Gooseneck
Gooseneck is part of the loosestrife family, and like it’s purple cousin, it has a dangerous spreading habit.
Bishops hood/Jack in the pulpit
A very intriguing shade plant.
Lamb’s Ears
Lambs ears are lovely in a children’s garden or a sensory garden, but can take over said garden in warmer growing zones.
Monkshood
A popular old-fashioned perennial.
Primrose
There are many varieties of Primrose, and not all are invasive. The hardy yellow cowslip variety is a prolific self-seeder. One reader laments that “the more you pull them up, the faster they spread.”
Obedient Plant
Obedient plants may behave in your flower arrangement, but they certainly don’t behave in the garden. They’re a flowering member of the mint family, so no surprises there. Obedient plants also use the alia Dragonhead flowers, as they resemble snapdragons.
Jacob’s Ladder/Polemonium
Another beautiful perennial that self-seeds like there’s no tomorrow.
Black Eyed Susan/Rudbeckia
Some varieties are more well behaved than others. Despite the spreading habit, they provide a welcome hit of colour for a long stretch in the summer.
Scotch Broom
Snow on the Mountain
This plant as pictured is extremely poisonous. It retains its poison even after it dies. Do not plant if you have small children or pets.
Spiderwort
Sometimes called Widow’s Tears. . . maybe because you’ll cry if you plant them? (Joke!!)
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Violets
Violets sometimes also go by the name Jenny jump ups or Johnny jump ups. Whatever you call them, they can be a little surprise in your lawn that’s hard to get rid of.
Shrubs
Chamisa/Rabbit Bush
Rose of Sharon
Rose of Sharon is not actually a rose, but a member of the mallow family. It’s a prolific self seeder, but is prized in the South Eastern US because it can tolerate the intense heat.
Yucca
Grasses
Ribbon Grass
Ribbon Grass is so beautiful, but over time will work it’s way into your other grass and is hard to get rid of.
Bamboo
Bamboo is excellent in it’s natural habitat. In your home garden? Not so much.
Horsetail Reed
Similar to bamboo and just as much if not more work to keep it where you want it.
Only in Texas
Prickly Pear Cactus
An edible cactus with a spreading habit. In colder climates this cactus does not spread. In really cold places, like where I live, they make adorable house plants.
Phewf, that was a long list! If you don’t see your most hated perennial on this list, check back to my original list of 28. Still not there? Head down to the comments and tell me about it!
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Kristen is a former farm kid turned urban gardener who owns the popular gardening website, Shifting Roots. She is obsessed with growing flowers and pushing the limits of what can be grown in her zone 3b garden. She also loves to grow tomatoes, but oddly enough, dislikes eating them raw.
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