It is hard to know the 10 best gardens USA because there are many different types of gardens.
There are vegetable gardens, rock, gardens, water, gardens, etc.
It really boils down to a personal preference of what type of garden you want, are you looking for flowers, rocks, water, vegetables, or whatever.
This website is actually more so designed for a person to easily select garden products and services to purchase on Amazon and the Internet.
Happy shopping !