Old poultry fencing - stretched across posts with two extra supports in the middle and I support the ends with bamboo canes threaded through to tie it up. These rows are approx 35 long. They support the stems, keeping the dahlias straight up when their young and a bit floppy/top heavy. They work really well, even in the wind, the wire in it really helps. Had these nets for probably 15 years now... used them for turkeys before this 
