When should I plant beans, considering the myriad factors that could influence their growth and yield? Is it solely dependent on the last frost date in my region, or should I also take into account soil temperature, moisture levels, and even the specific variety of beans I intend to cultivate? Are there optimal lunar phases or astrological considerations that might affect the germination and overall health of the plants? Furthermore, how does the timing of planting correlate with potential pests and diseases that tend to proliferate at certain times of the year? Could early planting expose my tender seedlings to late frosts, while delaying sowing past a certain window drastically reduce the harvest? Additionally, what role does climate change play in shifting traditional planting calendars, necessitating an adaptive approach to agricultural practices? Ultimately, how does one discern the perfect moment amidst such complexity to ensure a bountiful bean harvest?