Riddles: II

There is a plough that hath no share,
Only a coulter that parteth fair;
But the ridges they rise
To a terrible size
Or ever the coulter comes near to tear:
The horses and ridges fierce battle make;
The horses are safe, but the plough may break.

Seed cast in its furrows, or green or sear,
Will lift to the sun neither blade nor ear:
Down it drops plumb
Where no spring-times come,
Nor needeth it any harrowing gear;
Wheat nor poppy nor blade has been found
Able to grow on the naked ground.