The Content Of The Article:
- Rhizome barrier made of HDPE
- Install rhizome barrier correctly
- Do not put rhizome barriers too tight
- Ornamental shrubs with root shoots
A rhizome barrier is indispensable if you plant a spur-forming bamboo in the garden. These include, for example, the bamboo species of the genus Phyllostachys: They are also known by the German name Flachrohrbambus and with their rhizomes, the so-called rhizomes, conquer large areas over time, if not limited to the propagation space with a rhizome barrier. For most species of bamboos, vegetative propagation through rhizomes is even the most important propagation method, as many species are less likely to flower and consequently can hardly produce seeds. If you have a bamboo of the genus Fargesia in the garden, you do not have to make any varieties. These species grow horribly. So they form only short foothills and therefore need no rhizome barrier.
In the garden bamboo rhizomes are particularly treacherous, because a bamboo can hardly be caught again once it is "outgrown." First, the rhizomes are very tough and with the spade can hardly be cut, on the other hand, you have to carefully remove each piece of rhizome, so no new foothills form.
Rhizome barrier made of HDPE
The rhizomes can only be reliably controlled with a special rhizome barrier made of HDPE (high-pressure polyethylene) that is at least two millimeters thick. Barriers made of pond liner or even bitumen are easily pierced by the hard rhizome tips. Thanks to a special manufacturing process, HDPE has a high strength and is so tough that it can hardly be cut with a pair of scissors. Commercially, the material is available as 70 centimeters wide rolls and sold by the meter. In addition, you will need at least one special aluminum rail to connect the beginning and end of the web to form a ring. Our tip: Let the rhizome barrier overlap by ten to twenty centimeters and place one rail flush on the beginning and the end of each - so the closure is particularly stable and you prevent the rhizomes from growing into the overlap.
Install rhizome barrier correctly
The rhizome barrier should survive about five centimeters at the top
Dig the plastic ring 65 centimeters deep into the ground and let the top edge look out about five centimeters from the ground. Obviously, this is not the best solution, but it is necessary so that you can immediately see if individual bamboo rhizomes have overcome the barrier. The rhizome barrier should be inclined as slightly as possible to the outside, so have a slightly smaller diameter downwards. This has the effect that the rhizomes, which usually grow horizontally through the soil, are directed upwards when they hit the rhizome barrier instead of growing beneath it.
Do not put rhizome barriers too tight
The rhizome barrier must be at least 150, better 200 centimeters in diameter for a stand-alone bamboo so that the bamboo has enough root space available. If a bamboo suddenly takes care of after a few years and gets yellow leaves, is often a too small sized rhizome barrier the reason. The plant suffers from drought damage and then tends to grow in depth in the search for water reserves in the soil and to infiltrate the rhizome barrier. If it has too little space, the root pressure can become so great that it breaks the rhizome barrier. If you want to constrain a bamboo hedge, the width can be a little bit smaller because the bamboos can spread out to the sides. But even in this case, you should plan at least one meter wide. If you want to plant a bamboo grove, you should not provide each individual plant with a rhizome barrier, but the entire area with a long plastic sheet border.
Vinegar tree with autumn coloration: The plant has a strong tendency to run off
Ornamental shrubs with root shoots
In addition to the bamboo, there are still some woody plants that are notorious for their run-off. For example, the vinegar tree (Rhus typhina): He is undoubtedly one of the most beautiful autumn dyers, but can also spread by Wurzelausläufer strong. If you cut off the foothills with a spade or cut back on the tree's crown, all the more new daughter plants are formed - a genetic protective mechanism that will ensure survival of the vinegar tree. Similarly, other woody plants such as sea buckthorn (Hippophae rhamnoides), raspberry, blackberry or blackthorn (Prunus spinosa) behave. However, to keep them at bay, you do not have to set expensive rhizome barriers - a more stable pond liner is robust enough to limit spreading through the roots.