At New Year I spent some time on the Isle of Wight.
I am from the Island .
Lots of property has been bought by people from other areas.
What I noticed most was the lack of understanding about light conditions in the winter.
If a garden is to be viewed in the winter light, such colours as blue will not look very interesting.
They are too harsh.
Greens and browns would look much better.
So blue fences are not a good idea.
Black is also harsh.
Too much use of dark colours is depressing.
Therefore , get a designer that knows the area well.
The finishes product will be worth the extra effort.