Answer:
A harvest sown and reaped on the same day in an unplowed field. Which increases without growing, remains whole though it is eaten within and without. Is useless and yet the staple of nations.
Who spends the day at the window, goes to the table for meals. And hides at night?
A warrior amongst the flowers, he bears a thrusting sword. He uses it whenever he must, to defend his golden hoard.
The eight of us move forth and back. To protect our king from the foes attack.
Often held but never touched. Always wet but never rusts. Often bits but seldom bit. To use it well you must have wit.
What did the piece of wood say when he saw the screwdriver and screws approaching?