I have been making up raised beds in my garden which have been great. Not so great is the fact that not only my own cats but very cat in the vicinity think they are giant litter trays. So I bought some netting off Amazon to cover them. I have just made hoops with bamboo then used a couple of long bamboo poles to which I have fixed this netting. They are quickly removable for working or weeding the beds and neither cats nor birds can get onto the beds! I thought I would mention this because the product is pretty cheap at £20 for a 2m x 20m roll. It seems to be very robust product name is Ohuhu bird netting I think it would probably deter cabbage whites too.