which fields of engineering have to do with archtectural instances?

Question

what exactly is an engineer and which one does blue prints for a states landscaping

Answer 1

there are many fields of enginnering, but what it sounds like you are looking for is landscape architecture. that is the person who lays out designs for landscaping.

Answer 2

Landscaping, does not generally involve an engineer unless it is on a pretty large scale.
Then a civil engineer might handle drainage, retaining walls, etc.