Bricks, Masonry, Asphalt and Concrete - Block Wall

On the back of our house built in the 50's, the block foundation (below the aluminum siding) the cement that covers the block is cracking, and is coming away from the block on the backside of the house. You can literally touch it & it comes of in sections. I am needing to repair this, but I am also wanting to put a raised flower bed along the back of the house where this is occurring. The raised flower bed is going to serve two purposes, to look nice, and to divert water away from the foundation in flash flood conditions. I put raised flower beds on the side of the house, and have had excellent results (no block problems on that side). Anyway, I need some pointers on how to fix this, so I can move forward with the project. Also, I am a novice with concrete...Am I getting in over my head? I have bags of concrete, and a waterproofing chemical for concrete (it says concrete driveways...would that be ok for this project?)... Hiring a contractor at this time is out of the budget. I appreciate any advice...thank you in advance for your suggeestions.

I assume the cement you are referring to is stucco. Remove all the loose stucco and mix up mortar/stucco to replace it, apply with a trowel [may take 2 coats] and attempt to duplicate the finish. If you add a raised flower bed I would be sure to waterproof all areas below the dirt.

If the concrete you have is actually concrete [complete with rocks] it will not work for stucco. Stucco is basically a mixture of mortar and sand.