How much soil do i have need of to saturate surrounded by slope for garden? I'd like to put surrounded by a tier'd garden on the...

I'd like to put surrounded by a tier'd garden on the side of my house. Currently it is rock on a slope. The area is going on for 20 feet long by 12 cavernous w/ a 4 foot drop. How can I figure out how much soil I will have need of to fill contained by the area?
What is your favorite rose strictly for the...
Answers:    I would read aloud 480 cubic feet of soil so it's one foot insightful at the top and 4 feet weighty at the bottom. Of course if you just hang on to it at a slope and have it one foot philosophical everywhere you will only involve half as much 240 cubic foot.
What are the big leafy plants call?
Convert all your measurements from foot to yards, later multiply to find volume in Cubic yard. This will tell you how tons "yards" of soil you will require.
When can I plant Hibiscus that be dug...