One factor that many organic gardeners fail to take into account is day-length. Some flowers and a number of vegetables (particularly onions) require a specific day-length in order to mature properly, to regulate vegetative growth, and to trigger flower development.
Both quality and quantity of lighting, as well as warmth, can come into play where day-length is involved.
Day-length may be the most purely natural factor affecting any organic garden. This is because unlike other factors, such as fertility, soil quality, pH levels, and pest management, it’s difficult to manipulate.
Short of installing grow lights, there’s very little you can do to change day-length, so it’s a good idea to choose your flowers and vegetables carefully in order to maximize productivity.