depth of box too shallow....
I have one 4' x 4' box. This is what I plan to use
for square foot gardening. According to Mel, the author of both books on square foot gardening, he recommends that the depth of each 4' x 4' box be 6". You're supposed to make the depth of each box 6" so you can fill each box with 6" of whatever soil mixture you're going to use in your 4' x 4' boxes.
Unfortunately although the length and width of each 4' x 4' box were specified the height of what each 4' x 4' box should be to acquire a depth of 6" wasn't specified.
The depth of my box is 2-1/2". Can I just dig a hole that is 3"-6" then place my box there and fill the hole with whatever soil mixture I'm going to use.
Also I do have one last question and this is for future reference. What does the height of a 4' x 4' box have to be in order to acquire a depth of 6"? I am assuming that what the height of the box is will determine what the depth of the box will be, that's why I'm asking.