What Is Bermuda Grass Rhizomes (Growth & Spread Guide)
Bermuda grass spreads in two directions: underground through rhizomes and across the surface through stolons. Rhizomes are stems that grow below the soil, then send up shoots and roots from their nodes. This network helps Bermuda fill bare spots, but it can also carry grass into beds and neighboring lawns. Knowing how it grows helps you establish, mow, contain, or remove it.
A useful number to know is about 65°F (18°C): Bermuda seed germination is favored once soil stays around this temperature or warmer. That is a guide, not a guarantee, because soil moisture, cultivar, and local weather also affect growth. If Bermuda is showing up where you did not plant it, its underground stems may be part of the reason.
I find it helps to separate two things people often call “runners.” Stolons are visible stems that creep over the soil surface. Rhizomes grow below it, where they can be harder to spot and remove. Both can root and help the lawn spread.
Equipment Setup and Safety Preparation
Before working with Bermuda grass, identify what you have and where you want it to grow. Mark lawn edges, garden beds, irrigation lines, and buried utilities before digging or edging. The right tools depend on the job: a mower maintains turf, while hand tools can help inspect or remove small areas.
Identify the grass and choose an establishment method
Bermuda grass is a warm-season perennial. Common types may be grown from seed, while hybrid cultivars are generally established with sod, sprigs, or plugs. Check the seed label or cultivar information before choosing a method; not every Bermuda lawn is suitable for seeding.
If you are unsure whether a plant is Bermuda, look for creeping stems and grass shoots that appear along them. A single clue may not confirm the species. For a large lawn or a difficult identification, ask a local extension office or turf professional.
Before planting, decide where the grass should stop. Bermuda can spread beyond its original planting area, so mark the intended boundary and nearby beds. Check for buried utilities before using a shovel, edger, or other digging tool.
Prepare tools and work area
For mowing, use a rotary mower or reel mower suited to the height you plan to maintain. Use a sharp, balanced blade and set the deck to the target height. A dull or poorly balanced blade can leave an uneven cut; check the mower manual for setup and maintenance instructions.
For digging or edging, choose tools that let you remove or separate soil without scattering it across a bed. Wear eye protection, gloves, sturdy footwear, and hearing protection when using powered equipment. Follow the equipment maker’s safety directions, and keep bystanders away from the work area.
Bermuda Grass Rhizome Growth and Field Management
A rhizome is an underground stem, not a root. It can grow through soil and form new shoots and roots at points called nodes. Bermuda also spreads by aboveground stolons. Together, these stems help a healthy lawn fill gaps, but they can make unwanted spread harder to control.
How rhizomes and stolons spread
Rhizomes travel below the surface; stolons run along it. Both can produce new growth, so a patch may expand even when the original plant is no longer obvious. The depth of Bermuda rhizomes varies with soil, cultivar, and management. There is no single depth that works as a reliable containment boundary.
| Growth structure | Where it grows | What you may notice | Why it matters |
|---|---|---|---|
| Rhizome | Underground | New shoots emerging away from the visible edge | Can carry growth under a surface boundary |
| Stolon | Along the soil surface | Creeping stems with leaves and roots | Can spread over soil or into nearby beds |
| Root | In the soil | Anchors the plant and absorbs water and nutrients | Supports growth but is not the same as a rhizome |
A rhizome fragment can regenerate. That means digging or moving soil with living fragments may spread Bermuda rather than remove it. Avoid tilling infested soil or shifting it into a clean area unless you have a clear containment and disposal plan.
Establishment steps for a new lawn
- Choose the right material. Use seed only for a suitable seeded common cultivar. Hybrid Bermuda is generally planted as sod, sprigs, or plugs. Confirm the cultivar before buying.
- Plant in warm growing conditions. Seed germination is favored when soil is consistently around 65°F (18°C) or warmer. Warm conditions also support active growth, though local timing depends on climate.
- Prepare and water the site. Follow the seed or planting-material instructions for soil preparation and watering. Keep the area adequately moist during establishment, without assuming that one watering schedule fits every soil or weather condition.
- Check progress and repair gaps. Inspect the lawn as it grows. Bare patches can leave room for weeds or uneven coverage, so follow the cultivar’s guidance for filling them.
These steps support establishment, but they do not make Bermuda stay in place automatically. Plan for regular edging and inspection where the lawn meets a garden or other boundary.
Field examples: two different goals
Example 1: Filling a sunny lawn. A homeowner chooses a seeded common cultivar after checking the label. They plant during warm conditions, keep the seedbed adequately moist, and watch for even coverage. Once the grass is established, they mow at a height suited to the cultivar and mower.
Example 2: Keeping Bermuda out of a garden bed. A homeowner notices stems and shoots crossing a lawn edge. They mark the bed boundary, inspect the soil, and remove visible runners and rhizome-bearing material without spreading it through the bed. They continue checking the edge because buried rhizomes may extend beyond the visible growth.
These are practical scenarios, not guarantees of a particular result. Soil, cultivar, weather, and maintenance can change how quickly Bermuda fills or crosses an area.
Mowing, Edging, and Tool Maintenance
Mowing trims leaves and helps maintain a chosen turf height; it does not remove an established underground rhizome network. Many maintained Bermuda lawns are kept at roughly 0.5 to 2 inches, depending on cultivar and mower type. Follow cultivar guidance and avoid cutting off more than one-third of the leaf height at one time.
Set the mowing height to the lawn
Bermuda mowing height varies. Some cultivars and mower setups suit a lower cut, while others need a higher setting. Check local or cultivar-specific recommendations rather than treating the 0.5-to-2-inch range as one setting for every lawn.
Use the one-third rule as a practical limit: do not remove more than one-third of the leaf height in a single mowing. If the grass has grown too tall, lower it in stages instead of making one severe cut. This helps avoid scalping the lawn.
| Situation | Useful approach | Avoid |
|---|---|---|
| Routine mowing | Use the cultivar-appropriate height and mow as growth requires | Cutting off over one-third of leaf height at once |
| Uneven or ragged cut | Check blade sharpness and mower setup | Assuming a lower deck setting will fix a dull blade |
| Grass has become too tall | Reduce height gradually over more than one mowing | Removing most of the leaf in one pass |
| New lawn | Follow establishment and cultivar guidance | Applying a mature-lawn mowing schedule without checking |
A rotary mower or reel mower can be suitable for turf when it is set up for the target height. Keep the blade sharp and balanced, and follow the mower manual for adjustment and service. Chainsaw settings and wood-cutting specifications do not apply to mowing Bermuda or understanding its rhizomes.
Edge boundaries and clean tools
Edge the lawn where stolons cross into beds, paths, or other areas. Because rhizomes grow underground, surface edging alone may not stop all spread. Inspect the edge and remove unwanted growth, including rhizome-bearing soil where practical.
Clean digging tools and mower parts after working in an infested area. Soil or plant fragments stuck to tools can be carried elsewhere. Collect removed fragments and dispose of them so they cannot re-root; do not simply toss them into another garden bed or onto clean soil.
Seasonal Care and Rhizome Containment
Bermuda is a warm-season grass, so its active growth is strongest in warm conditions. Containment takes repeated checks, not a one-time cut. Track where new shoots appear, manage the lawn according to local conditions, and avoid moving soil that may contain living rhizomes into areas you want to keep free of Bermuda.
Inspect, maintain, and contain
During active growth, look along borders for stolons crossing the surface and shoots appearing beyond the lawn edge. Remove unwanted growth carefully, and check the soil for connected rhizomes. Since rhizome depth varies, do not rely on a particular digging depth as a guaranteed barrier.
If Bermuda is in a garden bed, remove fragments thoroughly and dispose of them where they cannot root again. Tilling can break rhizomes into pieces and move them through the soil. It may spread the problem, so do not till or redistribute infested soil without a containment and disposal plan.
For areas where Bermuda is wanted, keep the turf healthy and repair bare spots. Manage watering and fertility based on local conditions and the needs of the cultivar. Too much or too little of either can affect lawn performance, so use local guidance rather than a universal schedule.
What mowing can and cannot do
Mowing controls the height of top growth and can help keep a lawn neat. It generally does not eliminate established rhizomes below ground. If your goal is removal, mowing alone is not a reliable way to remove the underground network; address the rhizomes and stolons as well.
Before digging, identify the area to remove and consider where the soil and fragments will go. Keep removed material contained, and inspect the site again for regrowth. The extent and timing of follow-up depend on the amount of remaining plant material and local growing conditions.
The main takeaway is simple: mowing maintains the lawn, while edging and careful removal help manage spread. Regular inspection gives you a chance to find unwanted growth before it has moved far.
Conclusion
Bermuda grass rhizomes are underground stems that help the grass spread and recover, while stolons spread across the surface. Understanding both explains why a lawn can fill gaps and why it may also enter nearby beds. Match establishment and mowing to the cultivar, and use careful, repeated containment rather than relying on one cut or one fixed barrier.
If you are establishing Bermuda, confirm whether your cultivar is meant for seed or vegetative planting. If you are containing it, inspect both the surface and soil, and keep rhizome-bearing fragments from being moved to clean areas. Those steps reduce guesswork and help you choose the right approach for your goal.
Frequently asked questions
What are Bermuda grass rhizomes?
They are underground stems that can form new shoots and roots. They help Bermuda grass spread below the soil surface.
How does Bermuda grass spread?
It spreads through underground rhizomes and aboveground stolons. Both can produce new growth and help the grass fill an area.
How deep do Bermuda grass rhizomes grow?
Their depth varies with soil, cultivar, and management. No single depth is a reliable boundary for stopping spread.
Can a rhizome fragment grow into new Bermuda grass?
Yes. Rhizome fragments can regenerate, so collect and dispose of them where they cannot re-root.
When does Bermuda grass seed germinate?
Germination is favored when soil is consistently around 65°F (18°C) or warmer. Moisture and other local conditions also matter.
Can I grow hybrid Bermuda from seed?
Hybrid Bermuda cultivars are generally established with sod, sprigs, or plugs. Check the cultivar information before choosing a planting method.
How short should I mow Bermuda grass?
A common maintained range is about 0.5 to 2 inches, depending on cultivar and mower type. Follow cultivar-specific guidance and avoid removing more than one-third of leaf height in one mowing.
Will mowing get rid of Bermuda rhizomes?
No. Mowing trims top growth but generally does not eliminate an established underground rhizome network.
Can tilling remove Bermuda grass?
Tilling infested soil can break and move viable rhizome fragments. Do not till or redistribute that soil without a plan to contain and dispose of the fragments.
How can I reduce Bermuda grass spreading into a garden bed?
Inspect the edge, remove stolons and rhizome-bearing material, and dispose of fragments so they cannot re-root. Keep checking because underground growth may extend beyond the visible edge.
(This article was written by one of our staff writers, Evan Bradley. Visit our Meet the Team page.)
