Kohl rabi

pigeons and cabbage whites might go for them.

Both of these have been a pest on my plot when I have tried growing them without netting.

You can buy pop-up net domes that are square shaped for small spaces you want to cover, but they are also easy to make.  I use 2 flexible garden hoops in a criss-cross, then all you need is a bit of netting and a few pegs to secures it