Answer:
What kind of nail can be grown?
What devours all and can kill a king. Destroy a town and crushes mountains down?
What runs around the whole yard without moving?
A standard dimension for sandwiches and rulers
In spring I look gay, Covered in a green array, The warmer it gets the more clothing I wear, As the cold grows, I throw away my clothes.
Sometimes I am white, sometimes I am dark. Most people love me. What am I?