Madam I wish I could come and observe your gardening for a season, I have never been able to grow squat
http://squarefootgardening.org/square-foot-gardening-method
Try this easy method. My 28 year old computer programmer son who lives in the city of Philadelphia is using this method in his back patio. The soil mix is a bit of an investment for the boxes, but once you’ve done it for the first year, you just need to augment the mixture every year. After six years growing in a large ground plot, we slowly moved all our gardening into these boxes and I wouldn’t do it any other way now. It takes out so much of the labor of vegetable plots. Our first 4x4 wood boxes deteriorated last year, so my husband made replacements out of cinder blocks. He built a tall archway frame out of plastic pipes that connects two of the boxes which we use to grow pole beans and other vining plants.
And yes! All you need to do is lay newspaper or landscaping paper in a 4x4 sunny area of your lawn; build the frame; fill the box and plant.