need help with building a raised bed
I am building a raised bed in a corner of my backyard. It will run 9ft long along the fences and will be 4 ft wide by 2 ft high. The area is currently grass. My house is in a newer development (5 years) and I have heavy clay soil (I know...the idea of digging that stuff is hurting my back already!Damn builders!). I'd like to know what is the best way to approach this project. How much of the clay needs to be dug up? I've been reading about putting gypsum to amend the clay. I also read about gravel for better drainage. I plan on ordering a truck load of great soil from my local family owned garden center, but want the foundation of the bed to be perfect. Any advice?