Ferns can look lovely in some gardens, but honestly, they often get out of control. Their underground rhizomes spread fast, and they can quickly take over flower beds or landscaped corners.
Many gardeners end up fighting a losing battle with these stubborn plants. It gets pretty frustrating when ferns keep coming back after you’ve pulled them out repeatedly.
You don’t have to use chemical herbicides to eliminate unwanted ferns. There are several natural methods that actually work, like adjusting soil pH, letting in more sunlight, or simply getting your hands dirty and pulling out the rhizomes.
If you know what ferns like, you can make your garden less inviting for them and more welcoming for the plants you want.
1. Improve soil drainage with peat moss and perlite
Ferns love damp, poorly drained soil. So, if you want to make your garden less fern-friendly, improving drainage is a good place to start.
Peat moss and perlite can totally change your soil texture. When you add them, you get more air pockets, which help water move through the soil instead of sitting around.
Try mixing equal parts peat moss and perlite into your garden beds. This combo breaks up that dense, heavy soil that ferns love.
Peat moss brings in organic matter and helps with soil structure. It keeps things loose and drains better, but still holds enough moisture for most plants.
Perlite is a lightweight, volcanic rock that adds tiny air spaces. These help water drain instead of pooling—ferns hate that.
Dig up the top 6-8 inches of soil before mixing in the peat moss and perlite. Make sure you blend it well before replanting anything you actually want to grow.
With better drainage, ferns will start to struggle. They just don’t do well if the soil dries out between waterings.
This approach works even better if you combine it with other fern-fighting strategies. Plus, most garden plants actually prefer soil that doesn’t stay soggy.
Don’t forget: soil compacts over time, especially if you get a lot of rain. Add more peat moss and perlite each year to keep things loose.
2. Regularly cut or mow ferns to deplete energy
Ferns store a lot of energy in their rhizomes and roots. If you keep cutting back the fronds, you’ll force them to use up those reserves.
Mowing or using a string trimmer works for big patches. For small beds, just grab some pruning shears and snip the ferns as close to the ground as you can.
Timing matters. Cut them early in the spring when they first pop up, and keep at it all season.
If you cut them every 2-3 weeks, you’ll keep them from photosynthesizing enough. Over time, the plants will get weaker and eventually give up.
Stick with it—ferns can be stubborn, and they’ve got deep energy reserves. It might take a whole season (or more) to really see results.
Try combining cutting with other methods. For example, cut them first, then cover the area with cardboard or use an organic herbicide on the fresh cuts.
If you use a mower, set it as low as it’ll go. The closer you cut, the better.
Always remove the cut fronds from your garden. They might drop spores or even try to regrow if you leave them.
3. Dig up ferns, including roots to prevent regrowth
Digging out ferns by the roots is honestly one of the most reliable ways to get rid of them. Ferns grow from tough, woody rhizomes that snake through the soil.
Grab a garden fork instead of a shovel. The flat tines slide under the rhizomes without chopping them up, making it easier to remove the whole thing.
Dig at least 8-12 inches deep. You want to get as much of the rhizome as possible—any bits left behind can sprout new ferns.
As you dig, look for those brown, woody rhizomes. They’re the main culprits. Try to get every last piece.
Shake off the soil from the roots so you can double-check for leftovers. You also don’t want to lose too much good soil from your beds.
If you’ve got a big patch, break the job into sections. It’s less overwhelming, and you can focus on one area at a time.
It’s easiest to dig when the soil is damp but not soaked. Spring or fall usually works best for this.
Don’t toss the roots in your compost. They might just start growing in there. Bag them up for yard waste or let them dry out completely before getting rid of them.
4. Solarize soil by covering with clear plastic to kill roots
Solarization uses the sun’s heat to fry unwanted ferns right where they grow. You just cover the soil with clear plastic and let the sunshine do the work.
Start by cutting down all visible fern fronds at the base. Then, water the soil well—wet soil heats up better than dry.
Cover the area with clear plastic sheeting. Clear works better than black because it lets sunlight through and traps the heat underneath.
Weigh down the edges with rocks, bricks, or a little soil so the wind doesn’t blow it away. Pull the plastic tight so it hugs the ground.
Leave the plastic in place for at least 4-6 weeks, and do this during the hottest part of summer. If you live somewhere cooler, you might need even longer.
Temperatures under the plastic can reach up to 140°F (60°C), which is hot enough to kill most roots and weed seeds lurking in the soil.
Some folks try a “double solarization” trick: after 4 weeks, pull up the plastic for a couple of weeks to let any survivors sprout, then cover again for another month.
Heads up: solarization wipes out good soil microbes along with the bad stuff. You might want to add compost afterward to bring back the good guys.
This only works in full sun. Shady spots just don’t heat up enough, and summer is absolutely the best time for this.
Once you pull off the plastic, you’ve got a blank slate. Plant whatever you like—ferns and most weeds should be gone, at least for now.
5. Use mulch to suppress fern growth naturally
Mulch can be a simple but powerful tool against ferns. When you pile it on thick, it blocks sunlight and keeps fern spores from sprouting.
First, yank out as many ferns as you can—roots and all. Don’t skip this step or you’ll just be mulching over the problem.
Lay down 3-4 inches of organic mulch—try wood chips, straw, bark, or even leaf litter. If you want extra blocking power, put down newspaper or cardboard first, then add the mulch on top.
Mulch changes the environment under it. Ferns love moist, shady, slightly acidic spots, and mulch can tweak those conditions just enough to make them unhappy.
Keep an eye out for any new fern fronds poking through and pull them right away. Add more mulch as it breaks down to keep your barrier strong.
Some gardeners get even better results by combining mulch with other methods, like tweaking soil pH. It’s all about making your garden less cozy for ferns and more inviting for the plants you want.
Don’t expect instant results. Mulching works best as a long-term fix, not a quick one.
6. Remove shade by trimming overhanging branches
Ferns love shade. That’s why you’ll find them thriving under trees and big shrubs where the sun barely reaches.
If you want fewer ferns, let in more sunlight. Trim back overhanging branches and you’ll make your garden beds a lot less fern-friendly.
Focus on the branches that throw the most shade on your trouble spots. You don’t have to cut down whole trees—just thin out the canopy a bit.
Use sharp pruning tools and make clean cuts at the branch collar. This will keep your trees healthy while allowing light in.
The best time to trim is usually late fall or winter when trees are dormant. It’s easier on the trees, and you’ll have less sap.
Hiring a pro is probably safer for tall or tricky branches. Tree trimming can get risky fast if you’re not used to it.
After you trim, watch how the ferns respond. It might take a few weeks, but ferns should start to fade as more sunlight hits the ground.
This method works even better if you combine it with something like adjusting soil pH. Some folks say raising pH to about 6.5 makes the area less appealing for ferns and better for grass or other plants.
Just be careful—some shade might be important for your other plants. Try to strike the right balance so you don’t end up with a sun-baked garden.
7. Hand-pull young fern shoots before they mature
Catching ferns early is honestly one of the best ways to keep them in check. Young fern shoots—fiddleheads, as people call them—are so much easier to yank out than older, stubborn plants.
When spring rolls around and those ferns start poking up, the shoots are still soft and haven’t dug their roots in deep yet. You can usually pull them up by hand without breaking a sweat.
Keep an eye on your garden for new fern growth. Look for those classic curled fronds—they kind of look like the top of a violin.
Grab the shoot right at the base, as close to the dirt as possible. Pull steadily so you get the whole thing, roots and all, not just the top.
If you can, pull after it rains and the soil’s damp. That makes it way easier to get the roots out in one go.
Wear gloves, especially if you have sensitive skin. Some ferns can be a little irritating, and nobody wants an itchy afternoon in the garden.
Stay on top of it and pull regularly. Check each week during the growing season so you catch new shoots before they get out of hand.
Be careful with what you do with the pulled ferns. Don’t toss them in your compost—they might just keep growing in there! Bag them up with yard waste or let them dry out completely before you get rid of them.
8. Introduce native plants to outcompete ferns
Native plants can be surprisingly helpful when you’re trying to push back unwanted ferns. They’re adapted to your local conditions and, once established, can hold their own in your garden.
Just planting natives isn’t a magic fix, though. You’ll need to knock back the ferns first—maybe using some of the other tricks from earlier—before the natives really have a chance.
Pick native plants that like the same conditions as your ferns, but can eventually shade them or hog resources. Plants with strong, spreading roots can really claim space.
If your garden’s shady (where ferns usually love to hang out), try woodland natives like wild ginger, woodland phlox, or native sedges. They can gradually fill in and help block ferns from coming back.
Native shrubs are also worth considering. Things like serviceberry or native viburnums grow well in many places and can change the soil and light over time.
This is definitely a long game. The idea is to build a garden where your chosen natives thrive and ferns no longer get the upper hand.
Water and care for your new natives until they get going. Once their roots are strong, they’ll compete better with any ferns trying to sneak back in.
Some folks swear by using mulch with native plants. The mulch keeps ferns down while the natives settle in.
And if you want to get creative, add a boulder or a small tree. These bigger features can tweak the environment and make things less cozy for ferns, all while fitting into your native plant plan.
9. Avoid overwatering to reduce favorable conditions
Ferns just love damp, soggy spots. If you cut back on watering, you can make your garden a lot less appealing for them.
It’s easy to accidentally encourage ferns by watering too much. They thrive in constantly wet soil, spreading their rhizomes and popping up everywhere if you’re not careful.
Water your plants only when they actually need it—direct water to your favorite plants instead of soaking the whole garden.
Drip irrigation systems are a solid investment. They get water right where it’s needed and keep the rest of the soil drier, which ferns hate.
Set saucers underneath to catch extra water if you’ve got potted plants near a fern problem. That way, you’re not accidentally creating more damp soil for ferns to invade.
Look for spots where water just sits. Standing water is an open invitation for ferns. Mixing in sand or perlite can help those spots drain better.
Try to water in the morning. That way, any extra moisture evaporates during the day instead of sitting overnight—ferns are sneaky and take full advantage of nighttime dampness.
During rainy spells, use temporary covers over areas you’re trying to clear of ferns. It’s a bit of a hassle, but it keeps the soil from getting soaked again.
Most garden plants don’t need nearly as much water as ferns do. A lot of them do better if the soil dries out a bit between waterings.
Frequently Asked Questions
People always ask about natural ways to get rid of ferns without using harsh chemicals. Here are a few answers to the most common questions about removing ferns naturally.
What natural methods can effectively kill ferns in a garden?
Several natural methods work. Regularly cutting or mowing ferns reduces their energy over time. Digging up the whole root system is super effective, but it’s a bit of a workout. Solarizing the soil is another option—just cover the area with clear plastic during hot weather. The sun heats things up and basically cooks the fern roots underground. Improving drainage with peat moss or perlite helps too. Ferns really prefer moist soil, so making things drier can push them out.
How can I prevent ferns from regrowing once they are removed?
Try adjusting your soil pH. If you raise it to around 6.5, you’ll make it better for grass and less friendly for ferns, which like more acidic conditions. After pulling ferns, put down a thick mulch layer to block new shoots. No sunlight means no new ferns. Keep an eye out and pull any new ferns right away. Staying persistent is really the key here.
Is vinegar an effective solution for eliminating garden ferns?
Vinegar can work as a natural herbicide, especially if you spray it directly on fern leaves during sunny weather. The acetic acid burns the plant tissue. For tougher jobs, horticultural vinegar (it’s stronger than what you use in the kitchen) is better. Be careful not to hit your favorite plants, though. You’ll probably need to apply it a few times since vinegar doesn’t always kill the roots. It works best if you combine it with pulling the ferns out, too.
What non-chemical approaches work best for removing sword ferns?
Manual removal is your friend for sword ferns. Dig deep around the plant to get the whole root ball and rhizomes, or they’ll just grow back. If you keep cutting all the fronds down to the ground, the plant will eventually give up. Stick with it and remove new growth as soon as you see it. Smothering works too—cover the area with cardboard or newspaper, then pile on mulch. No light, no ferns.
Can household salt be used to control fern growth, and how?
Salt can kill ferns by messing with their water balance. Mix one part salt with three parts hot water and pour it right on the fern and the soil at its base. But use this carefully—salt can wreck your soil and hurt other plants. It’s best for isolated ferns far away from anything you want to keep alive. Salt can leave the soil pretty rough for a while. So remember before you plant anything else in the treated spot.
Conclusion
Getting rid of ferns naturally takes patience. You’ll need to stick with it for a while.
The methods in this article give you some solid alternatives to chemical herbicides. Changing soil pH to around 6.5 makes things tough for ferns, but most other garden plants won’t mind.
More sunlight can also slow down fern growth. Most ferns really love the shade, so brightening things up helps.
I’d probably try a mix of methods for stubborn types like asparagus or ostrich ferns. Pulling them up by hand, then tweaking the soil, usually works for smaller patches.
Prevention matters too, honestly. Keeping up with garden chores and acting early can stop ferns from taking over spots you don’t want them.
With these natural tricks, you can manage unwanted ferns and still keep an eco-friendly garden. The best approach really depends on your yard and which ferns you’re up against.
Hello there! I’m Elsa, and gardening is my passion. As an avid gardener, I created GardeningElsa.com to share my knowledge and experience with fellow enthusiasts. My website is a comprehensive resource for gardeners of all levels, offering expert advice on a wide range of topics, including plants, flowers, herbs, and vegetable gardening. Whether you’re a beginner looking to start your first garden or a seasoned pro seeking to expand your knowledge, GardeningElsa.com has something for everyone. Read more about me.
