When should I plant zinnias to achieve a vibrant and flourishing display in my garden? Given their stunning array of colors and hardy nature, I find myself pondering the optimal timing for such a delightful endeavor. Is there a specific season when these flowers demonstrate exceptional growth potential, or should I be contemplating my local climate and hardiness zone as pivotal factors in this decision? Might it be prudent to consider the average last frost date in my area, or could the temperature fluctuations influence their germination? Additionally, how do soil conditions and sun exposure interact with the timing of planting zinnias to ensure they thrive? What about pre-planting preparations, like selecting the perfect variety to suit my particular landscape? In seeking to cultivate a captivating bed of zinnias, what key insights and tips can be gathered regarding the timing of planting that ultimately lead to their splendid bloom? It seems there is much to unravel regarding this exquisite flower’s seasonal requirements.