Hello!:wave:
I have previously used this kind of thing for exactly that: https://www.amazon.co.uk/Green-Coated-Fencing-Garden-Galvanised/dp/B011OFYMX0/ref=sr_1_2?ie=UTF8&qid=1523742250&sr=8-2&keywords=green+wire+fencing
I've found if you're not going in too long of a straight line, it'll stand...