Posted: 19/01/2014 at 07:58
Clueless do you mean to put plastic on top of the soil and then lay flags? Or flags with plastic on?
I think the first would suppress any weeds etc. and would retain any water that drains from the pots and flags.
For cucumbers that would be good as they like humidity but not having their feet constantly wet. So I don't think 2nd option a good idea.
However if you grow tomatoes I believe they don't like the humidity, I only cause that when I damp down the floor to reduce temperature in hot conditions.
I am lucky that I have 2 GH's both standing on flags. I grow cucumbers on their own. Don't use growbags I put them in big buckets, I put drip trays of water in the GH each day, and mist the air. Also shade them as I find they don't like direct sun. Others might disagree with my method but I always get good cucumbers.
I've only grown toms & cucumbers together once and neither did all that well. Could have been the weather or many things.
Having typed all the above, I wonder if you meant to use plastic to partition part of GH to try and keep conditions different in each half ?? If so I'm not sure how effective it would be.
Hope others saw the Monty programme and can help you more.