Answer:
I am mother and father, but never birth or nurse. I'm rarely still, but I never wander.
A horrid monster hides from the day, with many legs and many eyes. With silver chains it catches prey. And eats it all before it dies. Yet in every cottage does it stay. And every castle beneath the sky.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.
A tree with 5 branches, no leaves and no fruits
You get many of me, but never enough. After the last one, your life soon will snuff. You may have one of me but one day a year, When the last one is gone, your life disappears.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.