Garden bed preparation in Calgary - help!
As I am preparing to create flower beds in my back yard, I am wondering if you can give me some tips on their preparation please, so that I can be successful with gardening in Calgary! Specifically, my questions are:
1. Is it mostly clay in Calgary?
2. How dig do I have to deep in my yard? The plan is to pile the soil/loam up so it's slightly raised in the centre of the bed (so it's not flushed with the lawn). Do I have to go as deep as one foot?
3. Should I be tilling the original soil at the bottom of the dug hole, and then mix it with new soil, so that there is no clear interface between the new and old soil please?
I need all the help that I need! Thank you so much for your help.