My mom had a beautiful bed of asparagus, unfortunately they kept disappearing and she couldn't figure out who was getting them. Then she discovered her own dog was carefully nipping them off and munching away.
The next thing was one of her grandsons' helped her put her gardens 'to bed' one winter and covered it with straw. The asparagus still grew but so did a gazillion weeds, making it very difficult to even find them.
I have some wild ones growing on the edge of a paddock - I usually find them after they've become 5' tall!