![]() When the day reaches a certain length, they will stop growing leaves and start thickening their below-ground structures: the bulbs that we want to harvest and eat. Onions are among the plants that are sensitive to how much light is available in a day. As gardeners, we sometimes need to pay attention to how long they’re getting. It’s spring – it’s onion-planting time, in fact – and the days are getting longer. Read on to find out what this means and why it’s important, though not as important here in Maryland as it would be if we lived in Mississippi or Minnesota. ![]() Have you ever looked through a seed catalog, deciding which onion seed or plants to buy, and been perplexed by the words “long-day” or “short-day” attached to each variety? Or sometimes “intermediate-day” or “day-neutral”? You might just give up in confusion and order by a familiar name or tasty-sounding description, but really, this is something you need to pay attention to, because onions are… photothermoperiodic! ![]()
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