MMM,
I don't know so much part of me thinks it is but then when I think about it it seems to make sense. Moon, gravitational pull and all that. I think in the UK we get so much rain the top surface, especially around spring planting, is always moist enough not to have to worry about things like that.
Whereas I'm wondering if being dryer in France whether or not it might help, albeit a little.
It's almost worth planting one row of something in conjunction with the lunar what-not and another row not. Give them the same TLC afterwards and see what happens.
I've also got some info on planting by the Zodiac...but lets not even go THERE!!!
