37 Plants You Don’t Want to Grow

These plants range from dangerous to problematic.

Family Handyman

When you think of unwanted plants, dandelions, quack grass and other weeds that bully their way into your yard and garden probably come to mind.

But, occasionally, a seedy character gets planted that either takes over the garden, gets you itching or causes a whopper of a stomachache (or worse) if eaten.

So how do you know what plants to avoid in your landscape? Start by identifying what’s already growing and make sure none of them made this blacklist. Then read on to learn why some seemingly innocent-looking beauties are the biggest backyard troublemakers … and how you can fight back!

Too much of a good thing

It’s covered with pretty, purple flower spikes from late summer through fall. A long-lived perennial, it adapts to a wide range of growing conditions. Plus, it makes a beautiful cut flower. It’s a gardener’s dream come true, right? Wrong!

It’s purple loosestrife. And as many gardeners throughout the United States and Canada know, this invasive blooming beauty, which has taken over many a backyard garden, has now taken to our natural wetlands. A vigorous grower, it crowds out native plants, eliminating cover and essential food sources needed by wetland wildlife.

Purple loosestrife isn’t the only invasive landscape plant causing problems in natural spaces. Norway and Amur maples have joined buckthorn and honeysuckle as woodland invaders. The lesson here? Do a little research before adding new plants to your landscape. Select plants suited for the growing conditions in your backyard. Then, check with your local extension service, an area nursery or online for a list of invasive species that plague your region.

Keep in mind, however, that it’s possible for a plant to be invasive in one area yet struggle to survive in another. Buttery bush, tamarisk and ivy are a few plants that are invasive in warmer locales but have a hard time making it in cold, wet and other less-than-ideal growing conditions.

Buyer beware

Some seed mixes have purple loosestrife in them. Be sure to check the label for this pretty invader.

Look, but don’t touch

Gas plant, meadow rue, euphorbia and hyacinths are common landscape plants that can leave some gardeners covered with an itchy, red rash. Though the list of potential irritation-inducing plants is long, not all gardeners will be affected by some—or even any—of these plants.

The best tactics to avoid the itch are to be careful about what you plant, be diligent about wearing protective garden garb and learn maintenance strategies that’ll keep your landscape looking good … and your skin rash-free.

Start by taking note of how the offending plant causes the rash, and make changes based on that information. For instance, some gardeners with sensitive skin develop a rash after only a few minutes of handling prickly plants. If this is you, be sure to wear heavy clothing and leather gloves, or convince your thicker-skinned gardening friends to help out.

Infamous plants like poison ivy or even some ornamental euphorbias also contain irritants in their saps that result in a painful and itchy rash. Wear long sleeves if you plan to garden around or weed these irritants out of your landscape. It’s also a good idea to immediately wash the irritating oils off your body and clothing to avoid further exposure and expansion of the rash.

Oddly enough, gas plant, wild parsnip and garlic mustard sap cause a rash only when the irritating oils are exposed to sunlight. That’s why some gardeners weed at dusk or by landscape lighting to eliminate the risk. But if you can work around these irritants only by the light of day, be sure to wear long sleeves and gloves and wash skin immediately.

Deadly beauties

It may surprise you to learn just how many plants can cause stomachaches, diarrhea or even death when eaten. Gardeners with small children and pets may want to avoid planting the very toxic datura and castor bean. The seed in the fleshy red fruit of the yew, the nuts of horse chestnut trees and all parts of the oleander plant are also toxic. And don’t forget the mushrooms Mother Nature sometimes scatters in the yard.

That said, perhaps the most important thing to do for children is to curb their sense of adventure when it comes to eating items from the landscape.

You should also keep houseplants, seeds and bulbs out of the reach of small children and pets. And store all garden chemicals in their original containers in a secure location.

Lastly, reduce the risk by identifying and labeling all your landscape plants. As a gardener, it is great to have a record of what’s planted where. But as a parent or pet owner, you never know when this kind of information will be useful in the case of an emergency.

Here are 15 Trees You Should Never Grow in Your Yard

Plants to avoid!

MAY Cause skin irritation
Garlic mustard
Gas plant
Juniper
Meadow rue
Pencil cactus (euphorbia)
Poison ivy
Poison oak
Poison sumac
Stinging nettle
Wild parsnip

Poisonous plants
Arborvitae foliage
Castor bean
Datura (angel’s trumpet)
Deadly nightshade
Dieffenbachia
Flowering tobacco
Lily-of-the-valley
Nuts of horse chestnut or buckeye trees
Oleander
Privet
Red fruit of yew
Virginia creeper berries
Water hemlock

Invasive Plants
Algerian ivy
Barberry
Buckthorn
Butterfly bush
Garlic mustard—not planted, but needs to be controlled
Honeysuckle
Japanese knotweed
Moneywort
Multifora rose
Norway maple
Purple loosestrife
Russian olive
Tamarisk
Teasel

Plus: Check out an awesome hanging herb garden in the video below.