How invasive is black bamboo in the uk?

I may attack it when the weather cools a little. The wrecking bar may also make another appearance​

 

Granted I never fertilised anything

 

As posted in another thread I had 3 black bamboo in 100 litre pots, they looked really good and were moveable (but heavyish) a couple of times I took them out of their pots to prune the roots with no ill effect, only downside of that is the width of the pot. Photo no to good I'm afraid

 

Would it be wise to wrap these in cling film before transporting them?

 

Got them home. Probably closer to 5m than 6m. Huge clumps though. Around 45kg each at a guess.

Got the hose soaking the roots now.

Think I’ve caught the bamboo bug. Hopefully my gumtree wanted ad will come up with the goods again.

Is this a good fertiliser, or is their a better choice? https://www.amazon.co.uk/Bamboo-Fer...ocphy=9046649&hvtargid=pla-421479322549&psc=1

 

I'd just use the same fertiliser as for everything else. Be careful with Gumtree you could easily get a thug.
I'm considering getting Thalmnocalmus crassinodus "Kew Beauty" hardy, clump forming, but a bit pricey.