Answer:
Hot tempered and sometimes it blows its top, making a mess of everything.
It covers you, you lose it every day and you'd die without it.
There are four of these, but everyone's favorite seems to be spades.
Inside a burning house, this thing is best to make. And best to make it quickly, before the fire's too much to take.
Every country has one, though we are not the same. Waving to our citizens, throughout the wind and rain. What is it?
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.