Hi all. I'm a newbie to this gardening stuff, so I have a novice question. I planted 10 Roma VF tomato plants 18" apart in a row, with concrete reinforcing wire cages around every other plant. Didn't have enough space to put one around every plant. Now, all the plants have sort of grown together to form a tomato hedge! Next year I think I will change spacing to at least 24", but am I ok with the 18" for this year? I'm worried about disease because the foliage is so thick. Please advise.