The danger of using the moon solely as a planting guide is that regional timing and environmental conditions are often overlooked. Many crops require certain ranges of soil temperatures before proper seed germination will occur. Some crop such as potatoes tolerate and produce best in cool temperatures while some require warm temperatures.
Some crops tolerate cold while others are killed by the lightest frost.
So obviously the environment and proper timing to achieve the optimum growing conditions must be taken into account when moon dates are considered. An annual is a plant that completes its entire life cycle within one growing season, and has to be seeded anew each year. Biennials include crops that are planted one season to winter over and produce crops the next, such as winter wheat. Perennials, bulb and root plants include all plants that grow from the same root year after year. A simple, though less accurate, rule is to plant crops that produce below-ground during the decrease of the moon.