40cm might be better but 30cm would do I think, anything less than the width of your coffee table shouldn’t obstruct too much. Have a look at metal trellis, it comes in all sorts of designs and would be less bulky than a traditional wooden one, or bo-peep style curved metal stakes. All sorts of support options out there that can be as temporary or as permanent as you like and can be painted to match your smart outdoor decor. Long zip ties are handy for attaching stuff without drilling, the transparent ones would be pretty discrete. Once the canes are growing and stiffening up in the right direction you can always remove the training wheels, so to speak 😊
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
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