When should I engage in the endeavor of planting lavender plants to ensure optimal growth and flourishing? Is there a specific season that is most advantageous for introducing these aromatic perennials into the garden or pots? With factors such as local climate, soil conditions, and the particular variety of lavender in mind, how can one best determine the right timing? Should I consider the average frost dates in my region, or perhaps the typical temperature ranges that favor vigorous root establishment? In addition, might it be beneficial to contemplate the overall health of my soil prior to planting? Are there particular lunar phases that are said to guide the best planting times for such herbs? With these various considerations swirling in my mind, how do experienced gardeners decant their wisdom into actionable insights regarding the ideal planting timeline for lavender? Could there be nuanced techniques to elevate the chances of a bountiful lavender harvest?