I planted them in rows. The rows were about 5 to 6 foot apart. At this time the rows are disappearing due to the vines growing together. I think weeding at this point is a hopeless cause. I will just let it go and see how they turn out in the end. The watermelon plants look great right now. They do have the yellow blossoms on them now. After the bloom I probably will be adding some liquid fertilizer through the overhead sprinkler system. Next time I will try to do a better job preparing the bed with a pre-emergent herbicide. Thanks for the comments.