To get rid of ferns in the garden, combine deep digging, steady cutting, mulching, and, if needed, careful spot herbicide use.
If you typed “how to get rid of ferns in the garden?” after staring at yet another patch of fronds, you are not alone. Once ferns get settled, their underground stems knit through the soil and keep sending up new growth long after you cut the tops.
The good news is that you can bring a fern invasion under control with steady work and a clear plan. This guide walks through how ferns grow, the most effective ways to remove them, and how to stop them creeping back into beds and borders.
How To Get Rid Of Ferns In The Garden? Step-By-Step Plan
Most gardens need a mix of methods. One patch might respond well to digging, while another needs repeated cutting or careful herbicide use. The table below compares the main options so you can pick the blend that suits your plot, time, and comfort level.
| Control Method | Best Use | Main Drawback |
|---|---|---|
| Hand Digging Rhizomes | Small beds or clumps near valued plants | Physically demanding and slow in heavy soil |
| Repeated Cutting Or Mowing | Larger areas where digging every rhizome is not realistic | Needs strict repeat cuts for several seasons |
| Smothering With Cardboard And Mulch | Beds you can cover for a year or more | Temporary bare look and no planting in that spot for a while |
| Transplanting Wanted Ferns To Pots | Saving special or sentimental fern varieties | Does not solve rhizomes left behind in the ground |
| Spot Spraying With Systemic Herbicide | Dense stands away from ponds and sensitive plants | Risk to other plants if spray drifts or runs off |
| Replanting With Dense Groundcovers | Finished beds where you want long term weed pressure reduced | Upfront cost and time for planting and watering |
| Improving Drainage And Light | Shady, damp corners where ferns thrive | Some sites cannot be changed enough to matter |
In practice, you will often dig out the worst clumps, smother or mow where you can, then replant with strong groundcovers to crowd out any stragglers.
How Ferns Spread And Why They Keep Coming Back
Ferns spread in two main ways: by spores and by underground stems called rhizomes. Spores float in on wind or arrive in soil and mulch. Rhizomes creep through the soil, branching and sending up new fronds well beyond the original clump.
Bracken fern shows how persistent this can be. The RHS bracken guidance notes that bracken rhizomes form dense networks and can run for several metres. When you cut the fronds once, the underground stores stay intact and send up more stems later.
Extension specialists echo this picture. A University of Maine Extension article on bracken fern stresses that repeated mowing or cutting is needed to exhaust those stores and that single treatments rarely finish the job.
This growth pattern explains why ferns look invincible after a quick trim. To win, you need to either remove or weaken the rhizomes over time and stop new spores settling into bare soil.
Getting Rid Of Ferns In The Garden Without Harming Other Plants
Many gardeners want to keep shrubs, perennials, or fruit bushes while pushing back the fern carpet. That calls for careful hand work near roots you want to protect and stronger tactics in open spaces.
Survey The Area And Set Priorities
Walk the bed and note where ferns are thickest, where they sit under or through shrubs, and where you can safely dig or mow. Decide which patches matter most this season: near a path, around a prized shrub, or in a vegetable bed.
If ferns have taken over a narrow strip, it can even be simpler to clear that strip fully and then replant, instead of trying to work around every stem.
Hand Digging Out Fern Rhizomes
Hand digging is slow, but it gives the most precise control around plants you want to keep. Water the area the day before to soften the soil, then use a garden fork rather than a spade. A fork loosens the ground with less cutting of rhizomes, so you can pull longer pieces out.
Start a little outside the clump, push the fork deep, and rock it back and forth. Lift the root mass and follow the thick, dark rhizomes with your hands, tracing them outward and pulling gently so they come up in long sections. Expect some to break; dig again around broken ends.
Where ferns weave through shrub roots, work slowly and remove the rhizomes in shorter pieces. Any chunk left in place may resprout, so plan on checking that spot again later in the season.
Dispose Of Fern Debris Safely
Do not add fern rhizomes to a cool compost heap, as many can survive and re-root when spread. Bag them and send them with green waste collection or landfill. In rural areas, some gardeners dry plants and burn them in line with local rules, though you should check local guidance before using that route.
Mechanical Fern Control Over Larger Areas
Wide beds or slopes often hold more fern growth than you can dig out in one season. In those spots, repeated cutting and smothering work together to weaken plants while you plan long term changes to planting and layout.
Repeated Cutting Or Mowing
If the area is open and fairly level, a scythe, brush cutter, or sturdy mower can take growth down to near ground level. Cut when fronds reach mid thigh height and are fully unfurled. Leave the cut growth to dry for a day or two, rake it up, and remove it.
New fronds will appear later. Cut again once they have enough leaf area to draw on the plant’s reserves. Over several seasons, this steady removal of growth starves the rhizomes. Patience matters here; stopping after one season usually lets the fern recover.
Smothering With Cardboard And Mulch
Where mowing is awkward, smothering works well. Lay plain cardboard in overlapping sheets over the fern patch once you have cut growth down. Wet it so it hugs the soil, then add a thick layer of wood chips or other bulky mulch on top.
Leave this in place for at least a full growing season. In many cases, you will need a second season for stubborn patches. The lack of light stops new fronds, and the buried rhizomes slowly lose strength.
Replanting To Outcompete Ferns
Once you have reduced fern growth, plant groundcovers, shrubs, or ornamental grasses close enough that little bare soil remains. A well planted bed keeps light from reaching fern spores and any rhizome pieces that remain near the surface.
Choose plants suited to your site’s shade and moisture. Shade tolerant perennials, tough hostas, and some evergreen groundcovers create a dense layer that makes life harder for fern seedlings.
Using Herbicides Against Ferns Safely
Some gardeners turn to herbicides when digging and cutting do not give enough control, especially with bracken or large wild patches. Any chemical step needs care, both for your health and for the rest of the garden.
Guidance from county weed control programmes and extension services notes that systemic herbicides such as glyphosate or dicamba can move through fern fronds into rhizomes. Documents like the Western bracken fern guidance from Thurston County describe how timing sprays to match full frond expansion gives better long term control of rhizomes while keeping doses within label rates.
Before you buy any product, read the label to check that ferns are listed and that garden use is allowed. Follow protective clothing advice, keep spray off desirable plants, and avoid streams, ponds, and drains.
When Herbicides Make Sense
Herbicides can be helpful where:
- Fern growth forms a dense stand with few other plants beneath.
- The area is too steep, rocky, or wide for full digging.
- You can keep people and pets away from the area until sprays dry.
They are a poor fit in mixed borders full of perennials, near vegetable beds, or near water features where drift or run off could reach fish or amphibians.
Fern Herbicide Options And Safety Notes
Home gardeners rarely need the full range of herbicides used in forestry or agriculture, but it helps to know the common active ingredients and their limits.
| Active Ingredient | Typical Use | Key Caution |
|---|---|---|
| Glyphosate | Non-selective systemic spray for spot treatment of dense fern clumps | Kills most green plants it touches; protect nearby shrubs and perennials |
| Dicamba | Often used in grass areas where broadleaf weeds or ferns are a problem | Can move in soil and harm trees or sensitive plants downslope |
| Asulam | Used in some regions for bracken control in forestry or pasture | Registration and allowed settings vary; check local rules carefully |
| Pelargonic Acid And Similar Contact Sprays | Burn down top growth on young or small plants | Do not reach deep rhizomes well; regrowth likely |
| Homemade Vinegar Or Salt Mixes | Sometimes suggested in informal sources | Uneven results, soil damage, and no label or safety guidance |
Always treat herbicides as one tool among many. Even when sprays knock ferns back hard, follow up with replanting and mulching so the cleared space does not fill with new fern seedlings or other problem weeds.
Preventing Ferns From Returning
Once you have paid the price in time and effort to reduce fern growth, prevention feels far more appealing than starting again. A few habits keep the problem from building up.
Check For New Fronds Regularly
New fern fronds often stand out as pale green curls among darker foliage. Walk your beds every couple of weeks in spring and early summer. Where you see a new shoot in a cleared area, pull or dig it at once before it feeds energy back into the rhizome.
Near fences or hedges, fern rhizomes from neighbouring land can creep into your soil. Cut new growth along these edges quickly so it never has time to build a colony on your side.
Keep Soil Covered
Bare soil invites fern spores and other weed seeds. After digging out ferns, top the soil with compost and then a layer of mulch. As you replant, aim for spacing that lets mature plants touch or nearly touch, so little light reaches the surface.
In spots where shrubs are still small, temporary annuals or short lived perennials can fill gaps while permanent planting grows in.
Adjust Conditions That Favour Ferns
Ferns thrive in cool, moist, shaded ground with organic matter. You may not want to change all of that, but small tweaks can help. Prune branches that give heavy shade over beds meant for flowering plants, and improve drainage in soggy corners with raised beds or added grit.
If you enjoy ferns but not their spread, keep chosen varieties in large containers or raised planters. That way you can enjoy the texture without letting rhizomes roam through nearby beds.
Practical Checklist For Fern Control In The Garden
To pull all of this together, here is a simple checklist you can follow over the season when dealing with how to get rid of ferns in the garden?
- Map the worst patches and decide which areas matter most this year.
- Hand dig around prized plants, taking time to pull out thick rhizomes.
- Use mowing or brush cutting on large, open stands and repeat during the season.
- Smother stubborn areas with cardboard and mulch for at least one full season.
- Where suitable and legal, use carefully timed spot herbicide treatment on dense patches away from beds and water.
- Replant cleared areas with dense, site-suited groundcovers and shrubs.
- Walk the garden regularly, removing any new fronds before they regain strength.
- Keep soil covered and avoid leaving bare, damp corners for fern spores to claim.
Fern control takes patience, but each season of steady work leaves your beds easier to manage. With a clear mix of digging, cutting, smothering, and careful planting, you can shift a fern-dominated corner into a garden that better matches your plans.