Posted: 30/05/2013 at 07:15
BB, sounds like you've got great ventilation - including that breeze - so that gives you a huge head start.
Yes, around 3' between plantings is the acknowledged preferred minimum. And, yes, it's in an ideal world. Obviously not everyone can achieve it. As I said to windowgardener further up the page, you are ultimately dictated to by your circumstances.
Unless you spray against fungal diseases, air circulation is your best means of minimising the chances of fungal diseases. Plant spacing is only one of the numerous bits of housekeeping you can practise.
Others include keeping the foliage as dry as possible, nipping off excess branches and foliage to avoid impenetrable clumps forming and hindering air circulation, and maintaining a gap between the lowest foliage and the soil. Fungal spores can and will fall from the foliage to the soil and be splashed back up again during watering. The gap helps against this.
Ultimately, the closer you plant the toms together, the more care you need to take.