Reading one of UB's threads I found this link http://www.mellowgold.com/grow/mjbotany-removed/. It's covering marijuana botany very thoroughly. The following quotation is from that site: Since ancient times man has observed the effect of the moon on living organisms, especially his crops. Planting and harvest dates based on moon cycles are still found in the Old Farmer� Almanac. The moon takes 28 to 29 days to completely orbit the earth. This cycle is divided into four one-week phases. It starts as the new moon waxes (begins to enlarge) for a week until the quarter moon and another week until the moon is full. Then the waning (shrinking) cycle begins and the moon passes back for two weeks through another quarter to reach the beginning of the cycle with a new moon. Most cultivators agree that the best time for planting is on the waxing moon, and the best time to harvest is on the waning moon. Exact new moons, full moons, and quarter moons are avoided as these are times of interplanetary stress. Planting, germinating, grafting, and layering are most favored during phases 1 and 2. The best time is a few days before the full moon. Phases 3 and 4 are most beneficial for harvesting and pruning. Root growth seems accelerated at the time of the new moon, possibly as a response to increased gravitational pull from the alignment of sun and moon. It also seems that floral cluster formation is slowed by the full moon. Strong, full moonlight is on the borderline of being enough light to cease floral induction entirely. Although this never happens, if a plant is just about to begin floral growth, it may be delayed a week by a few nights of bright moonlight. Conversely, plants begin floral growth during the dark nights of the new moon. More research is needed to explain the mysterious effects of moon cycles on Cannabis. Very interesting indeed. Mysterious to us, modern men. Don't know about you but I'll sow my next batch of seeds on the rising moon.