Cortaderia - move or not?
When I started our garden voyage last year, I stuck a Cortaderia in the central planter as shown below, I had no knowledge at all back then and have since learnt they are pretty invasive plants.
This autumn/winter, i need to work my way round that planter, lifting the plants and refilling the soil as it has dropped about 6", we were thinking of moving it from the planter to the real soil currently lurking under the white gravel along the fence.
My main concern is that i have read they like to put down runners and can pop up some distance away - knowing my luck in the middle of next doors lawn
Should I move it or maybe get a big isolated planter for it somewhere or something else???

This autumn/winter, i need to work my way round that planter, lifting the plants and refilling the soil as it has dropped about 6", we were thinking of moving it from the planter to the real soil currently lurking under the white gravel along the fence.
My main concern is that i have read they like to put down runners and can pop up some distance away - knowing my luck in the middle of next doors lawn

Should I move it or maybe get a big isolated planter for it somewhere or something else???

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They can grow to a fair size and the leaves are very sharp. I have helped next door neighbour with his over the years and they are big, tough things.
Personally l would remove it from the planter and get rid of it altogether. If you're looking for a grass, there are many to choose from, such as Miscanthus or Stipa. The Knoll Gardens website will give you plenty of ideas.
https://www.knollgardens.co.uk/
They're used to stabilise loose soil banks because of their huge root systems.
I'd get it out asap.
That sort of confirms my worries. It was a bad choice but we knew nothing back then
I'll dig it out ASAP and bin it, plenty more fish in the sea.
The leaves, as @AnniD says are edged with tiny sharp spines.
And WEAR GLOVES
Yes i have witnessed the leaves
I'll give it a severe haircut then start digging, I do use riggers gloves on tough stuff.
It was rooting into the wood frame of the planter as well.
Luckily it only seems to have gone down about 10" and to around 36"dia.
Question - are the cotton-thread root remnants likely to re-root or die off ?
I'll get a sieve next time we visit the garden centre but ??
I got a garden sieve on freecycle . It's one of those things that folk , literally, have hanging about the shed.