I have heard farmers say that they plant just before a full moon.
According to the theory, plants that are sown in the few days before a full moon become stronger and more productive, and those sown as the moon is waning tend to be less so.
The moon gardeners claim that the gravitational force of the full moon affects the level of groundwater in the soil, just as it does the level of the oceans. With more water being drawn up into the soil during a full moon, any newly-sown seeds are boosted by the increased hydration.
Plants are also said to benefit from the bright light reflected from the sun by a full moon, with some believers claiming lunar changes cause distortions in the Earth’s magnetic field that can encourage or limit plant growth.