First, we need to know the background.
When you look around the landscape of Britain you can see a vast difference between the north and south.
The south being more fertile for growing vegetation and livestock, the ground is relatively flat with a mild weather; where as in the north the rugged terrain and harsh climate is more ideal for livestock.
Having livestock, you will need a way to keep them in. In the south, Farmer will grow hedgerows as a means of securing the land. With the mild climate the plants can grow quicker than the animals can eat them.
Now in the north copious quantities of stone are easily found close to the ground surface, its here you will find evidence of dry stone walls. The walls are found where trees and hedges are difficult to grow.
On lower ground where hedges could be grown, they take longer to mature and can be stunted if exposure to animals to early, the saplings and new growth could be eaten quicker than the plant can grow, making this method of security difficult to establish.
Once a stone wall is erected, it will remain until neglected or dismantled. The walls would need little upkeep, if build properly.
The materials were easy to get, this is the reason stone and hedges were used. Yearly maintenance checks would ensure the longevity of the walls and hedges.
Fact – when farmers/labours where building their stone walls, they would put a trinket or coin in-between the gaps as a time capsule.
Fact- Prince Charles hosted a hedgelaying competition on Highgrove estates, this allowed different skills to be exercised. More.