We no longer recommend using the praised bed technique for containing bamboo except in the most impossible areas. We believe that in-ground a pruning trench or rhizome barrier are best and that above ground containers (such as galvanized metal stock tanks) are best. The raised bed technique described below works, but the maintenance has been more extensive that we initially believed it would be, requiring addition of material each year and re-shaping the top of the bed due more-than-anticipated volume and shape reduction from composting and erosion. That being said, the method does work and may be a viable option if you very wet soil, very rocky soil, and/or beds too large to make containers a viable option.
Original 2017 Article:
Many times containment is a second thought for people who have bamboo planted. Sometimes that’s OK since a pruning trench or rhizome barrier can be installed a year or two after the bamboo planting with good results and minimal, if any, rhizomes escaping to unwanted areas. However, I recommend that anytime you’re installing a running bamboo, you should either install containment at the same time or have a plan in place.
One containment technique that can only be installed at the time of planting (or before) is the raised bed. This works on the same principle as the pruning trench: rhizomes are naturally shallow and grow horizontally. If they reach a vertical drop, either straight down or very steep, they’ll come out of the side the soil, thus exposing themselves, before they dive back in. With a pruning trench, which is a 12” deep, ~5” wide trench around the bamboo, the vertical drop is achieved below ground level. But you can also get this same result by created a raised mounded bed above the soil line.
There are two important factors when using a rhizome-pruning method of controlling bamboo: proper installation, and proper maintenance. For a proper installation, we’re looking for at least 12” of vertical drop within 12” or less of horizontal span. IE, a 45-degree angle or steeper. You can get this by simply mounding up soil and packing it down on the side to achieve the angle.
I recommend using at least a 2” shallow trench as an extension of the sloping soil to mitigate any wash out the new soil may have during the first years of rains. You can also use a deeper trench and shorter bed, as long as you have at least 12” of combined drop.
The raised bed technique is useful in areas with a lot of existing roots, utility lines, or other obstacles to trenching. It also can give your initial bamboo planting some added height, effectively speeding up the fill-in time for something like a privacy screen.
During installation, the first (lowest) layers of soil to be brought in should be heavier with more clay in them. As you build the bed up, use lighter and richer soil, topping it with pure compost and then hardwood mulch. What you’re trying to do is make the conditions favorable to the rhizomes at the top, and not favorable on the bottom. I usually recommend a single- or double-shredded mulch on raised beds since they will control erosion better and last longer than a triple-shredded mulch.
Maintenance for a raised bed is the same as it is for a pruning trench: walk around the edge 2-3 times per summer, and 1-2 times per fall, and once in the winter and spring depending on the weather. If any rhizomes have shown themselves, simply clip them with a pair of hand pruners. If you wish you can then pull the rhizome out on the outside of the bed, but this is usually unnecessary since it likely isn’t mature enough to survive on its own.
During maintenance, you’ll likely need to rake out the shallow trench of any leaves or other debris that may have filled it. If you are noticing rhizomes near the bottom, you may want to deepen your trench by an inch or to be sure nothing tunnels below. Some rhizomes can go deeper than others, depending on the bamboo type, soil type, and how much water is available on the top.
Speaking of watering, the best practice it to keep it moist on top, but not necessarily let the water soak deep. This is the opposite of conventional wisdom for most plants. Remember, rhizomes tend to follow the water, sun, and organic matter. A soaker hose set to a very short duration (try 5 minutes to start) every day or every other day is a good option, depending on the time of year and how much direct sun it gets.
For small beds less than 12’ long, you may want to perform maintenance more often, at least at first, to make sure your bamboo is spreading into areas you want it.
6/11/2021 09:54:38 am
Great article! Thank you for sharing this informative post, and looking forward to the latest one.
2/18/2022 06:39:58 pm
Hi, We have bamboo beds 21/2 feet by about 20 feet....The bamboo shoots are getting smaller and smaller in diameter...I think it is root bound. How do we deal with this? We are thinking that all the runners on the top layer that are above ground should be removed, and mulch added....We are afraid that this might hurt the bamboo....What do you think??? Thanks so much!
9/19/2022 09:40:29 am
Hello, I have a similar setup: raised beds 4meters by 1.2 meter, 40 cm high (13' x 4' x 16"high). it is important to regulary prune off the rhyzomes that you see on top, and also regulary prune off the old canes. sometimes even take out asmuch as 50 % of old canes. If you remove the cane, whats under the ground, that should rot, and thus, make space for new growth. If you dont do this regularly, the bambooo could eventually overgrow the space...
Thanks for helping me understand that areas with lots of existing roots would be best done with raised bed techniques, especially when there are utility lines and other obstacles. I guess we already need to get that kind of process done to ensure that the plants in our backyard will not affect the utilities. We can get bamboo removal services so that they can be transferred to a raised bed like what you have mentioned.
11/28/2022 10:25:37 am
I want to raise my own bamboo, but I'm not sure how to go about it. It makes sense that I might want to look into making a raised bed for them so that they aren't washed out by rain. I'll build that raised bed first before I get the bamboo sprouts.
2/2/2023 08:42:03 am
I don't think you really need a raised bed. usually, what you need is to dig a trench around and place a HDPE barier around it. You find tons of tutorials. Use at least 1mm thick (2 is even stronger) with the smooth side towards bamboo (to reflect rhyzome growth better). The barier plastic should be placed, so that at least 5-10 cm above ground (so you can easily check if the rhizomes didnt creep above (once a year is ok). So this arier already helps you a lot if it rains to much..
2/2/2023 08:11:15 am
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2/2/2023 08:11:40 am
Thank you for the wonderful content.
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David is founder of Brightside Bamboo and dreams of world where bamboo is utilized in helping solve our biggest problems.