Burning heathland

Heath areas with lots of heather are a distinctive landscape.
Where first in the month of march it is burned down in many places around.
To keep the heather from being “overgrown” by grass, bushes and trees.
Following this, the heather grows up rapidly and covers the landscape again.
Heather areas are referred to be natural areas, but are ir really that.?
Man-made and nature-made are two different things as I know.