A bamboo root barrier stops underground rhizomes from spreading into areas where you don't want them.
Running bamboo species spread through rhizomes that can travel several metres underground in a single growing season. Without physical containment, those rhizomes will push under fences, through garden beds, and into neighbouring properties.
This guide covers the types of bamboo root barrier available, how deep to install them, and the common installation mistakes that let rhizomes escape.
Need root barrier material? Browse the root barrier range at All Stake Supply or contact the team for bulk pricing.
Running bamboo (Phyllostachys species) sends out long horizontal rhizomes that can extend as far as the height of the culms above ground. A 6-metre-tall bamboo can push rhizomes 6 metres outward in every direction, and they will travel under concrete, asphalt, and fences without slowing down.
The first few years after planting are deceptive. Newly planted running bamboo often stays compact for 6 to 7 years before rhizomes start spreading aggressively, and by the time you notice shoots appearing several metres away, the underground network is well established.
Clumping bamboo (Bambusa species) behaves differently. Its rhizomes are short and grow upward into new culms rather than outward. A clumping bamboo planted in one spot will stay in roughly the same footprint, expanding by just a few centimetres per year.
The distinction matters because a bamboo root barrier is designed specifically for running species. If you are unsure which type you have, check the rhizome structure at the base of the plant.
Most problems start because someone planted running bamboo thinking it would stay put. It doesn't.
A bamboo root barrier is a continuous sheet of high-density polyethylene (HDPE) installed vertically in a trench around the bamboo planting area. HDPE is the standard material because it resists root penetration, does not degrade in soil, and remains flexible enough to conform to trench walls without cracking. Standard specifications for bamboo containment start at 1000 microns (1mm), which is what All Stake Supply's root barrier products are rated at.
Some landscapers try to use corrugated iron, concrete, or thin plastic sheeting as a cheaper alternative. These materials fail over time, and the cost of removing an established bamboo invasion far exceeds the cost of proper HDPE barrier.
The material cost difference between proper HDPE barrier and a makeshift alternative is minimal compared to the cost of dealing with escaped bamboo.
For Australian conditions, the minimum recommended depth is 600mm. Most bamboo rhizomes travel in the top 300mm of soil, but they can go deeper in sandy or loose ground. Installing a 600mm barrier gives you a safety margin that a shallower barrier does not. All Stake Supply carries 600mm x 1000 micron root barrier in 50-metre rolls, which suits most residential and commercial bamboo containment jobs.
The barrier should sit with 50mm to 100mm protruding above ground level. This is the detail most people miss. Rhizomes naturally travel just below the soil surface, and if the barrier sits flush with the ground, they will climb over the top.
| Barrier depth | Best suited for | Soil type |
|---|---|---|
| 450mm | Small residential plantings | Hard clay |
| 500mm | Medium plantings in average garden soil | Loam, mixed |
| 600mm | Large plantings, aggressive species | Sandy, loose |
If you are not sure which depth to choose, go with 600mm. It is better to install a deeper barrier than you need than to discover a 450mm barrier was not deep enough after rhizomes have escaped underneath.
Dig a trench around the bamboo planting area to the full depth of your barrier material, minus 50mm. So for a 600mm barrier, you need a trench approximately 550mm deep, with the remaining 50mm sitting above ground level. The trench only needs to be about 150mm wide.
Unroll the barrier into the trench with the smooth side facing the bamboo. Rhizomes tend to follow along smooth surfaces rather than penetrating them. Where the barrier material overlaps, allow at least 600mm of overlap and secure the join with stainless steel clamps or butyl tape.
Here is the installation sequence:
Cutting corners on the overlap is the single most common installation failure. Rhizomes will find a 100mm gap in the join and push straight through it.
The biggest mistake is installing the barrier too shallow. A 300mm barrier might seem adequate because most rhizomes sit in the top 300mm of soil. But one deep-running rhizome under a shallow barrier defeats the entire installation.
The second most common problem is not leaving barrier above ground. A barrier that sits flush with the soil surface is a barrier that rhizomes will crawl over within a season or two.
Other mistakes that lead to failure:
Once running bamboo escapes containment, removal costs far more than the barrier would have.
Annual check: Walk the barrier perimeter once a year. Look for rhizomes that have grown over the top lip or soil erosion that has exposed the barrier edge. Trim any escaping rhizomes immediately.
All Stake Supply stocks root barrier in three depths, all at 1000 micron thickness in 50-metre rolls. The right size depends on your soil type and the species of bamboo you are containing.
For most residential bamboo plantings in average soil, the 500mm root barrier is adequate. If you have sandy soil, loose fill, or aggressive Phyllostachys species, step up to the 600mm root barrier. The 450mm root barrier suits smaller contained plantings in heavy clay.
To calculate the length you need, measure the perimeter of the containment area and add 600mm for the overlap join. A circular planting with a 3-metre diameter needs roughly 10 metres of barrier (pi x 3 = 9.42m, plus overlap).
All Stake Supply delivers Australia-wide and guarantees complete delivery, so your barrier material arrives in one shipment rather than in parts that delay the job.
Yes, and the sooner the better. If you already have running bamboo without a barrier, installing one now will prevent further spread. The process is the same as a new installation, but you will need to cut back any rhizomes that have already extended beyond your intended containment line.
Dig the trench at least 1 metre outside the current root mass. As you dig, cut any rhizomes you encounter with a sharp spade or pruning saw. Do not leave severed rhizome sections in the ground outside the barrier, because they can regenerate.
For properties where running bamboo has already spread into neighbouring gardens or under infrastructure, a root barrier alone may not be enough. You may need to physically excavate escaped rhizomes first, then install the barrier to prevent re-invasion. In severe cases, contact your local council. Some Phyllostachys species are declared noxious weeds in parts of NSW, and the Weeds Australia database tracks their distribution nationally.
Planning new bamboo? Install the root barrier before planting. It is far easier and less expensive to install a barrier in an empty trench than to retrofit one around an established root system.
A bamboo root barrier is a one-time installation that saves years of fighting escaped rhizomes. Browse the full root barrier range at All Stake Supply, or contact the team for trade pricing and bulk orders on rolls and accessories.
