Posted: 10/02/2014 at 09:33
I think you need to go to the Library and read as many books as you can find on the Japanese style. It's not just the plants, it's the whole balance of rock, stone, water, moss and a limited palate of plants.
You'd have to do a lot of ground work to prepare the soil and lay weed reisistant membranes for the gravel areas. You'd also need to source and price rocks and think about getting all the materials into the garden.
Usual plants include bamboo, Japanese maples, spring flowering cherries, azaleas, hostas and moss.
Have a look at this site too - http://www.aboutjapanesegardens.org/ It explains the basics and gives examples of Japanese gardens and their creation.