I grow 4 rows of plants in each bed with the canes spaced 25cms apart down the rows.
The canes are inserted 10cms into the soil and are fastened to a straining wire near the top.
I use 7ft canes as my beds are already 2ft off the ground.
I have a wooden apex structure which allows me to form a polythene tent anchored down by guy ropes. This is useful when cultivating in wet weather. It is not used for the main growing period but only for strategic shows during the flowering months.