[Growster...]

Unless they're 'Tom Tiddler' fashion, one back, one forward etc DD.

We always do 12 in the greenhouae that way, over an 6' length

Have done so for years, but in effect, it is a double row we're doing, and the ones away from the glass seem to do exactly the same as the ones in the front.

They're in pots and water trays though - not in border soil.

The OP's got nearly twice as many, though - that's really crowded.

Probably agree there DD.

[Mr Rotavator]

I too followed Monty's advice to squeeze lots of plants into a small area (about 20 plants up one side of a 8' x 6' greenhouse direct into the soil). All my plants now have blight, but I have a great crop of green tom's so lots of green tom' chutney to make 

In my laziness I didn't sterilize the greenhouse at the begining of the season that I had just purchased secondhand.

I will be growing my tom's the same again next year as the plants were strong and the yield was high.

[DD.]

Sterilising the greenhouse would not have had en effect on whether you got blight or not as it's wind-born.

Cramming them in like that is asking for botrytis though, in my opinion, which is often mistaken for blight and is made worse by poor air circulation around plants.

[JayG]

Agree with DD, and/but if you are unlucky enough to have blight spores blowing into your greenhouse the condensation and humidity resulting from overcrowding would provide perfect germination conditions for them too! 

[DD.]

That's two of us then who can't understand M.D.'s take on cramming them in!

[mumofstig]

make that 3...the toms in my g/house got Botrytis, badly, without cramming them in.
So if he did say to do that......

[Mr Rotavator]

Sterilising the greenhouse would not have had en effect on whether you got blight or not as it's wind-born.

Cramming them in like that is asking for botrytis though, in my opinion, which is often mistaken for blight and is made worse by poor air circulation around plants.

I'm very sure it's blight as the leaves, stem and fruit are all affected. Also, the infected areas do no look or appear to furry or fuzzy.

Reading the posts in this thread I think I'll give them more room next year.