Answer:
What leaps one time out of four?
I'm a green veggie that looks like a tiny tree.
I'm the start of eternity and the end of space. There are two of me in heaven and one in hell.
I'm a starchy plant tuber that is one of the most important food crops, cooked and eaten fried, such as french fries.
Men in skirts blow into these.
Cycle Cycle Cycle.