When should I harvest onions to ensure optimal flavor and storage longevity? Is it based solely on the calendar, or are there specific indicators that signal it’s the right moment to pull them from the ground? With various onion varieties, does this complicate the timing, as some mature more quickly than others? Should I be attentive to the foliage, observing when the green tops begin to yellow and flop over? What does this phenomenon signify in terms of the bulb’s readiness? Furthermore, might environmental factors, such as soil conditions and weather patterns, affect the timing of the harvest? How can I determine if the bulbs have reached their full size and flavor potential? Are there specific tests I can conduct, like checking the size of the bulbs or the condition of the outer skins? Ultimately, how can I ensure that I’m harvesting my onions at the perfect time to maximize their culinary and storage qualities?