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One of the things I saw a guy doing on youtube was just going round the outside of a clump and sticking a spade down into the ground cos the runners are quite close to the top of the soil. That might work. That's my plan if it all goes wrong and starts showing like wildfire!!

I genuinely didn't think you could grow it outside China till recently!! What a small minded doofus I felt when I found out it grows everywhere!!

I will try that spade trick. Thanks for the tip. It really grows like wildfire ;-)

Lol, then I will be trying it too!!!