The phase of the moon has absolutely no influence over anything other than how easy it is to see at night
out of context - my comment refered specifically to the subject in question. But the simple point is that it is not the phase, but the position of the moon that influences tidal motion. The phase is the moons position relative to the suns position from our viewpoint.
Tidal movements are mass actions, a cumilative effect of millions of kg of material being gravitationally attracted to another mass. Seedlings are too small for gravitational variations to have any effect, after all, do you feel any physical effect of the moons gravity?
quite right, WG, we should allow the possibility, but not to assign any probability without reproducible evidence.
the simple fact is, there is not, to my knowledge, any scientific evidence that this works, and most gardeners would be far better concentrating on known, proven methods than following old wives tales.
SK is correct with the explanation of how a seed will germinate and flourish only in suitable environmental conditions.
I think that where the idea of lunar cycle sowing has originated, and why it may show some results, is that the moons cycles are a usefull measure of time across the year, along with the solstices and equinoxs, and so ancient agricultural communities would have used the moon to measure the seasons. The 'markers' provided by the full moons (which we all know were named depending on the particular cultures activities at that time, ie our 'harvest' and 'hunt' moons) would have indicated the time during the seasons in which conditions, on average, were suitable for various agricultural activities, such as sowing. Around these full moons the farmers would have paid more attention to other natural indicators of conditions in order to determine when to plant.