If you’re looking for a guide on how to get rid of hostas, you’ve likely found that these popular shade plants can become surprisingly tenacious. Removing an established hosta patch requires a persistent approach to dig out its tough, spreading root system. What started as a few decorative clumps can quickly turn into an invasive colony, crowding out other plants and dominating your garden beds.
This article provides clear, step-by-step methods for permanently removing hostas. We’ll cover everything from manual digging to chemical controls, ensuring you have the right strategy for your situation.
You’ll learn how to tackle both small infestations and large, established patches. Let’s get started on reclaiming your garden space.
How To Get Rid Of Hostas
Successfully eliminating hostas depends on understanding their growth habit. Hostas grow from a central crown with thick, fleshy roots called rhizomes. These rhizomes spread outward, creating new growth points. If you leave even a small piece behind, the plant can regrow.
The best method for you depends on the size of the patch, your available time, and whether you wish to use herbicides. Below, we outline the primary strategies.
Manual Digging And Removal
This is the most straightforward and chemical-free method. It’s best for smaller patches or when you want to immediately replant the area. The key is thoroughness.
You will need a few basic tools: a sharp spade or garden fork, a sturdy trowel, a pair of pruning shears, and a tarp or wheelbarrow for debris.
Step-By-Step Digging Process
- Water the area thoroughly the day before. This softens the soil and makes digging easier, reducing the chance of roots snapping.
- Use your shears to cut all the hosta foliage back to about an inch above the crown. This removes obstructions so you can see the base of the plants.
- Starting at the outer edge of the clump, push your spade deep into the soil, about 8-10 inches away from the central crown. Your goal is to get underneath the root mass.
- Lever the spade to loosen the entire clump. Work your way around the plant, loosening it from all sides.
- Once the clump is free, lift it onto your tarp. Shake off excess soil to expose the root system. This is where you must be meticulous.
- Inspect the hole and the surrounding soil for any broken, white rhizome pieces. Remove every fragment you can find.
- Dispose of the hosta material properly. Do not compost it unless your compost pile gets very hot, as rhizomes may survive. Bagging and discarding with yard waste is safer.
Smothering With Tarps Or Cardboard
If digging seems too labor-intensive, smothering is an effective passive technique. This method kills hostas by completely blocking sunlight and air. It works well for larger areas.
The process is simple but requires patience. You’ll need to cover the area for an entire growing season to ensure success.
- Mow or cut the hosta foliage as low as possible.
- Water the area lightly to help materials conform to the ground.
- Cover the entire patch with a thick layer of overlapping cardboard or black plastic (UV-stabilized landscaping fabric works too).
- Weigh down the covering with rocks, mulch, or soil along all edges and in the center.
- Leave the covering in place for at least 4-6 months, preferably through winter. Check periodically to ensure it hasn’t shifted.
After this period, the hostas and their roots should be dead and beginning to decompose. You can then remove the covering and prepare the soil for new plants.
Using Systemic Herbicides
For extremely large or stubborn infestations, a systemic herbicide may be the most practical solution. These chemicals are absorbed by the foliage and transported to the roots, killing the entire plant.
It is crucial to choose a product labeled for broadleaf perennials and containing glyphosate or triclopyr. Always, always follow the manufacturer’s instructions precisely.
Safe and Effective Herbicide Application
- Apply herbicide in late summer or early fall when hostas are actively transporting nutrients down to their roots.
- Choose a calm, dry day with no rain forecast for at least 24 hours.
- Protect nearby desirable plants with a shield or by carefully painting the herbicide only onto the hosta leaves.
- Spray or brush the herbicide onto the foliage until it is thoroughly wet but not dripping.
- Allow the herbicide to work for 7-14 days. The leaves will yellow and wilt.
- Once the foliage is dead, you can dig out the decaying root crowns more easily. Dispose of all plant material, as it will contain herbicide residue.
Remember that herbicides are a last resort. They can affect non-target plants and soil health if used incorrectly.
Preventing Hosta Regrowth
Your job isn’t done once the plants are removed. Hostas are notorious for returning from leftover root fragments. Vigilance in the following seasons is essential for complete control.
Monitoring And Follow-Up Treatments
For the next one to two growing seasons, inspect the area regularly. Look for any new, spear-like shoots emerging from the soil. These are you’re signal that a piece of rhizome survived.
Immediately dig out any new sprouts, ensuring you get the attached root piece. For persistent shoots, a spot treatment with herbicide using a small brush can be effective without disturbing the entire area.
Soil Solarization For Persistent Problems
If hostas continue to come back, consider soil solarization. This uses the sun’s heat to kill roots, weed seeds, and pathogens in the top layer of soil.
- After initial removal, till the soil lightly and rake it smooth.
- Water the area deeply to conduct heat better.
- Cover the soil with clear plastic sheeting, sealing the edges with soil.
- Leave the plastic in place for 4-6 weeks during the hottest part of summer. The trapped heat will pasteurize the soil.
What To Do With The Area After Removal
Once you are confident the hostas are gone, you have a clean slate. Preparing the soil properly will help your new plants thrive and outcompete any stray hosta bits.
Soil Amendment And Replanting
Hostas can deplete soil nutrients. It’s a good idea to amend the bed before planting anything new.
- Turn the soil to a depth of about 12 inches.
- Mix in several inches of well-rotted compost or aged manure to improve texture and fertility.
- You can also add a balanced, slow-release granular fertilizer according to package directions.
- Choose new plants that are vigorous and suitable for the light conditions. For shady areas, consider ferns, astilbe, or hellebores, which are less likely to be invasive.
Using Landscape Fabric And Mulch
To further supress any potential regrowth from deep or missed roots, a physical barrier can help. Install a permeable landscape fabric over the soil before adding your new plants. Cut X-shaped holes to plant through.
Top the fabric with 2-3 inches of organic mulch, like shredded bark. This adds another layer of protection, conserves moisture, and gives your new garden a finished look.
Common Mistakes To Avoid
Even with the best intentions, a few errors can lead to hostas returning with a vengance. Here are the top pitfalls to steer clear of.
Incomplete Root Removal
The number one mistake is not digging deep or wide enough. Hosta roots can extend far beyond the visible foliage. Always dig a wider berth around the plant than you think you need, and sift through the soil carefully for broken, white root pieces.
Improper Disposal Of Plant Material
Tossing hosta crowns and roots into a casual compost pile is an invitation for trouble. Those rhizomes can survive and spread when you use the compost. Always bag and dispose of them with your yard waste, or leave them in a sunny, dry place to dessicate completely before composting.
Misapplication Of Herbicides
Using the wrong type of herbicide (like a pre-emergent meant for seeds) or applying it at the wrong time (in spring when sap is flowing upward) will yield poor results. Always use a systemic post-emergent herbicide and apply it in late summer or fall for best root kill.
Frequently Asked Questions
How Do You Kill Hostas Without Digging?
You can kill hostas without digging by smothering them with cardboard and mulch or by using a systemic herbicide. Smothering takes longer but is chemical-free. Herbicides work faster but require careful application to avoid harming other plants.
Will Vinegar Kill Hosta Roots?
Household vinegar may burn back the top growth of hostas, but it is unlikely to kill the deep, established root system. It is a non-systemic contact killer, meaning it doesn’t translocate to the roots. The plant will often recover, making vinegar an ineffective solution for permanent removal.
How Deep Do Hosta Roots Go?
Hosta roots are relatively shallow but wide-spreading. The main root mass typically resides in the top 6 to 12 inches of soil, but the tough rhizomes can extend horizontally several feet from the original plant, making thorough removal a challenge.
Can You Get Rid Of Hostas Permanently?
Yes, you can get rid of hostas permanently with diligent effort. The key is complete removal of the entire root system through persistent digging, effective smothering, or correct herbicide use, followed by vigilant monitoring for regrowth over the next two seasons.
What Is The Best Time Of Year To Remove Hostas?
The best time to remove hostas is in early spring as they emerge or in late summer/early fall. In spring, the soil is moist and the new growth makes roots easier to identify. In fall, applying herbicide is most effective as the plant sends energy down to the roots for winter storage.