There is a fine line between a natural looking and careless looking town that I also tried to find the right balance with. What I think worked for me was having a separate (and decently large) forest area away from all the houses (this was possible due to a lucky town map), and I had it go from normal trees and light coloured flowers around its entrance (including jacob's ladders), to a bamboo and bushy area with a fountain (the one with the two pots), to a dense pine tree area with a few perfect fruit trees, a resetti hole, and four leaf clovers and hybrid flowers.
I really enjoy that area of my town now! I also had one of those corrals at the border of the bamboo and pine area to hold some of my favourite flowers and baskets of fruits. and put mushrooms around the entry area