How to divide a bed 13' x 10'?

I've dug into my memory bank and remembered Gertrud Franck's book on Companion Planting. She grew rows of spinach between her crop rows. Once the spinach had grown, it was cut down and left as a mulch to walk on. Grass cuttings and soft leaves were added to the spinach paths. The following year, she would move her rows over a bit so that she planted crops in the spinach row (which had composted and improved the soil) and she would grow spinach where the crops had grown.
This means that half of the plot is mulched with spinach every year and the mulch stops weeds germinating between the crop rows.
Who knows, I may be growing in rows next year!!