Mine is about a metre tall. I made my net too low this year (using 4' canes, with about a foot (30cms) pushed into the ground) and the sprouting bits grew through it, which is of course not the idea
I took the net off before the snow and most of the plants survived. Each one should be tied to it's own cane for support, especially the taller varieties. Some of mine are much taller than others - I always grow a few of various varieties of everything; I think it's 'Lancer' which is extra tall. To make supports for the net, I stuck tennis balls on the ends of the upright canes, then threaded more canes along the sides of the net and pinned them down with wire hoops, made of old fencing wire. The ends are held with bricks or old stobs. When you buy your mesh/net, make sure it's wide enough to stretch over the whole affair. LBS horticulture do a good deal on strong black knitted netting in various widths, which should last for several years.