I mean nothing, but I am still a number. What am I?

I am not snow, but I still cover the ground white when it's cold. What am I? Solve the riddle → I am full of holes, but I can hold water. I can also catch fish or carry oranges. What am I? Solve the riddle → I help control the heat at home without speaking. What am I? Solve the riddle → I have a long neck but no head. I hold beautiful flowers, red or blue, instead. What am I? Solve the riddle → You blow into me to make a loud sound. What am I? Solve the riddle →