I'm in the process of planting my garden, and I had planned 3 ft wide raised beds with a single soaker hose running down the center of each one. I am using a square foot layout, so there will be 3 rows across most of the beds. Will this hose layout be enough to reach plants that are in the outside 2 rows? Or do I need to run 2 hoses between the rows, so they're 18" apart? I'm not sure if soil composition or density will greatly affect the moisture distribution or not. Is this just something I'm going to have to experiment with to determine?