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Premium SupplierPermalink Reply by Ofer El-hashahar on April 6, 2012 at 16:57

David you got to understand that some materials got no flexibilty- walls will break so as tarmark on roads.

I did lots of research of hours and asked people that used it for many years. It worked for them, and it is what offered in germany and in the USA. 

It is also david the way you use it, We use to overlap both ends, so it means if the rhizome push the barrier the pressure is only on the soil behind it and not on the barrier, While if you do the same on wall/ bricxks etc all pressure goes on them as they got no flexibility, Once they crack roots and rhizome can penetrate it and while getting wider will open it and go through.

It is the same with trees roots rhizomes and lots more.

I must admit- I am not sure what you are saying is based on - have you hads 2mm hdpe in your hands?

Why dont you ask me for sample? and see - you may change your mind.

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Premium SupplierPermalink Reply by Ofer El-hashahar on April 6, 2012 at 19:59

If you try to use herbicides, the chance it will work is low and depend on the length of the rhizomes, temp etc.

If wish to increase the chance that it will work, feed the roots area with any nitrogen feed, that will make the herbicides to move faster, before the plants can 'break' it. May sounds odd , but thats how it works. This trick was thought by my tree biology professor that got world wide name.

David , you challenged me to proof, and show what others think.

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PRO MemberPermalink Reply by David Cox on April 6, 2012 at 20:24

I have seen / handled heavy duty 2mm HDPE used as a geo-textile barrier under 2ft of Type1 (to seperate it from solid clay sub-soil) laid as a foundation for a Concrete hardstanding that would take 20ton+ loaded farm trailers. I based my statement on the fact that It seemed not alot tougher than the HDPE (about 1mm) that I HAVE seen perforated by a bamboo (Phyllostachys japonica) near a pond. This HDPE was used as a geotextile under a patio with the aim of protecting it from a cherry trees adventurous surface roots.

I must stress that this was a Horizontal barrier - so it was a hard surface behind the HDPE the bamboo was pushing against. - You point out that this is used in your example to stop it spreading, so the pressure goes against the soft soil behind the HDPE - I can see this working, and had overlooking this fact, although I would still hold the opinion that Bamboo COULD break through eventually if it could focus its pressure on a single point. I suppose something like a layer of sand behind it may help?

Ofer El-hashahar said:

If you try to use herbicides, the chance it will work is low and depend on the length of the rhizomes, temp etc.

If wish to increase the chance that it will work, feed the roots area with any nitrogen feed, that will make the herbicides to move faster, before the plants can 'break' it. May sounds odd , but thats how it works. This trick was thought by my tree biology professor that got world wide name.

David , you challenged me to proof, and show what others think.

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Premium SupplierPermalink Reply by Ofer El-hashahar on April 6, 2012 at 21:07

David,

I made something for you and others here,

a collection of videos about the bamboo spreading and the barriers ...

btw,

If anyone try herbicides, It may work on short rhizomes, but usually the plant will break the herbicides with the time. So I can suggest feeding the plants roots with any nitrogen feed- that will make the movement of herbicides  faster and will increase the chances to kill it - even that I truly think they are very low if the rhizomes are long.

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PRO MemberPermalink Reply by Paul McNulty on April 6, 2012 at 21:25

I only watched a couple of the videos, but it does reinforce what I was always taught; bamboo spreads through surface shoots. Surely a root barrier isn't going to have much effect here, what's needed is to cut off the surface shoots as they appear? Certainly before they spread across the lawn!

I would go back to my previous comments. Bamboo should be planted by sinking the plant in it's pot, with the base cut off and the top a couple of inches proud of the surface. That way it's got a root barrier for free, and any surface shoots can be nipped off easily.

I agree with you about spraying, you need to remove the majority of the plant mechanically then perhaps deal with any small regrowth with chemicals.

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