Different plants means different areas. Not all plants can tolerate the same elements as others when it comes to nature. There are many plants that can tolerate wet sites, sunny sites, dry sites or shady ones and others that would never survive in the same areas. This will point out several plants for those hard to fill spots and also ones that will add different interests to each area.
Protected Sites
Wet Sites
Dry Sites
Shelter these plants from harsh winds and winter sun.