We tried a keyhole garden last fall, and it did no more to keep out vermin than would using a screen for an umbrella. So, we surrounded it with fence, which made some improvement except for burrowers, and skinny rabbits. That season was a fail. Spring has been quite the opposite! By adding a light cloth-like screening cover directly on top of the crop, we overcame the moths, allowed in the light, and deterred browsers. The kale seems delighted.