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I think the soil texture is the issue. Bamboo grows around me like weeds.
9 years is enough to make it firm though.

I will do a bit of research and try again. If I can get another 9 years from one I will be happy!

With loamy soil, you need less than 9 years to keep a bamboo plantation booming.

Then loamy it shall be! The soul at the back isn't the best so I could just rework the whole area. Might go for loads more

Try it and let's see how it goes.

I sure will!