I'm sure the Ag Extension wouldn't recommend this method, but I'm all about the intercropping.
This last fall I planted a patch of blueberries and mulched them over heavily with pine bark,
straw, moss, sticks and whatever other organic matter I could find. Then in the spring, since the plants were small, I figured why not plant some sweet potato slips in between and make better use of the space? So I did, fertilizing with
urine, when I thought of it, and
watering occasionally when it didn't rain for a week or more. As the vines rambled, I picked them up and moved them around the blueberry bushes as best as possible and picked lots of leaves for my salads.
Then, this weekend, I started digging. I had a patch that was about 15 x 30, I suppose, though you have to subtract a chunk of space for the 10 blueberry plants, the olive tree, a large dogwood, a few nitrogen fixers, a guava, a thornless blackberry and three young pomegranate
trees. I also had another little hugelculture bed in my garden that was maybe 4 x 8 and dedicated to just sweet potatoes... but majority of the sweet potatoes in this shot came from the incredible vines growing around the blueberry patch.
I'm going to post a
video of the harvest soon but I haven't finished editing it yet.
Permaculture is the bomb.
Feed the soil... and:
I also just posted a profile of sweet potatoes as a survival crop here:
http://www.floridasurvivalgardening.com/2012/10/survival-plant-profile-sweet-potatoes.html
(You guys inspire the heck out of me. My kids keep asking to watch the
Outhouse video every time I log in. I must've seen it 4 or 5 times now. Hee.)