How To Get Rid Of Bermuda Grass In Flower Beds
Bermuda grass is the enemy of many gardeners who love their flower beds. It creeps in on runners and underground rhizomes, steals moisture and nutrients, and stubbornly returns after you think you’ve cleared it. If you’re fed up with digging up little wiry stolons every week, this guide will walk you through proven, practical methods to remove Bermuda from flower beds and keep it out for good.
Why Bermuda Grass Is So Difficult to Remove
Bermuda grass spreads by above-ground stolons and underground rhizomes, plus seeds. Those underground pieces store energy and sprout again even after the top growth is removed. It thrives in heat and tolerates drought, compacted soil, and heavy traffic, so flower beds that are sunny and well-drained are especially inviting.
“I once cleared a bed thinking I’d won, only to find it reseeded and creeping back from the edge the following summer. Patience and persistence are the gardener’s friends when it comes to Bermuda.”
Overview of Effective Strategies
There is no single magic fix. The best results come from combining several approaches: physical removal, smothering or solarization, selective herbicides when needed, and prevention measures like edging and mulch. I’ll lay out step-by-step options so you can choose what fits your bed and your tolerance for chemicals.
Hand Digging and Excavation
If the infestation is small or you prefer chemical-free methods, hand digging is the starting point. It works but requires vigilance.
- Water the bed a day before to soften soil.
- Use a sharp spade or hori-hori knife to dig deeply and follow the rhizome network.
- Remove every piece you can find; even a small rhizome left behind can regrow.
- Inspect weekly for new shoots and remove immediately.
From experience, I know how satisfying it is to see a cleared bed, but expect to pull regrowth for a season or two. Persistence wins.
Smothering: Cardboard, Fabric, and Thick Mulch
Smothering deprives Bermuda of light and starves the rhizomes over months. It’s low-cost and chemical-free.
- Lay down layers of wet cardboard or heavy landscape fabric over the affected area.
- Overlap seams and wet the cardboard to keep it in place.
- Add 3–6 inches of organic mulch (bark, wood chips). The thicker, the better.
- Leave in place for several months; success improves if you cover during the hottest months when Bermuda is actively growing.
This method is slow but effective for beds where you can tolerate the wait and temporary disuse. I’ve restored a perennial patch this way over a single scorching summer and came back to mostly dead Bermuda—then dug out the remaining bits.
Solarization: Use the Sun to Kill Rhizomes
Solarization uses clear plastic to trap heat and cook the rhizomes. It’s most effective in summer in full sun.
- Moisten soil and smooth it out.
- Cover with clear plastic, seal edges with soil or rocks.
- Leave in place 4–8 weeks during the peak of summer heat.
- Remove plastic and plant or follow up with smothering if needed.
Solarization killed most of the Bermuda in a third of my bed after six weeks one summer. It’s a great option if you can block off the bed for that period.
Chemical Control: What Works and How to Use It Safely
Herbicides can be effective, especially for large or deeply-rooted infestations. Choose the right type and follow label instructions.
- Non-selective herbicide (glyphosate): Kills everything it touches. Useful for clearing a bed completely before replanting. Protect desirable plants and use spot applications. Repeat treatments are often needed.
- Grass-specific herbicides (sethoxydim, fluazifop): These target grasses and spare many broadleaf ornamentals. They work well for spot-treatment when you want to keep surrounding flowers.
- Residual herbicides (imazapyr): Very effective but can persist in soil and harm future plantings—use with extreme caution and read labels carefully.
Always wear gloves and eye protection, apply on calm days, and avoid drift onto desirable plants. I’ve used a grass-selective product on a bed of daisies with good success—one to two applications a month apart cleared the Bermuda without harming the flowers.
Targeted Application Techniques
To protect your flowers when using herbicide:
- Use a wick applicator or paintbrush to apply herbicide directly to Bermuda leaves.
- Spot-spray with a shield around the target plant to avoid drift.
- Wait until Bermuda is actively growing (warm season) for best uptake.
Prevention and Long-Term Maintenance
Once you’ve cleared the worst of it, take steps to prevent reinfestation:
- Install physical edging (metal, plastic, or stone) at least 6–8 inches deep to block stolons and rhizomes.
- Keep a thick layer of mulch—3–4 inches of organic mulch discourages seedlings and slows stolon growth.
- Monitor bed edges and adjacent lawn; treat incipient runners right away.
- Consider raising beds or using clean soil and clean tools to avoid introducing rhizomes.
- Maintain vigorous ornamental plants; healthy beds outcompete weeds.
When to Consider Rebuilding the Bed
Sometimes the Bermuda network is so pervasive that the fastest long-term solution is rebuilding the bed. Remove topsoil, replace with fresh soil, and install a root barrier. This is more drastic and costly but gives you a fresh start.
Final Tips and Personal Experience
Expect persistence. Bermuda is a tough opponent, and most successful eradications take multiple seasons. Mix techniques—digging plus solarization plus a targeted herbicide application often does the trick.
From my own garden: I removed a bed of volunteer Bermuda by hand-digging the worst of it, solarizing for five weeks during July, then applying two spot treatments of a grass-specific herbicide the following spring. It took a year of upkeep, but now that bed thrives with daylilies that shade the soil and prevent reestablishment.
Be patient, stay observant, and don’t be afraid to combine methods. You can reclaim your flower beds from Bermuda and enjoy them without constant battle.
Safety and Final Reminder
Whether using tools, smothering, or herbicides, follow safety recommendations, wear gloves, and read product labels. If you choose chemical control, use the least persistent, most targeted product appropriate for your planting.
Happy gardening—and good luck beating that stubborn Bermuda. With persistence and the right approach, your flower beds will soon be the stars of your garden again.
