Generally, no, you should not top your onions if you are aiming for large bulbs. Topping onions can actually hinder bulb development.
Here's a more detailed explanation:
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Topping and Bulb Size: Breaking over the tops of onion plants will not increase the size of the bulbs. In fact, it can prevent the bulbs from enlarging. The leaves are essential for photosynthesis, which provides the energy needed for bulb growth.
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Bolting Onions (Flowering): If your onions have developed flower stalks (bolted), it means they are focusing on reproduction rather than bulb growth. In this case, your best course of action is to harvest them and use them fresh. Bolted onions don't store well and the bulbs won't be of high quality.
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Why Onions Bolt: Bolting can occur due to several factors, including temperature fluctuations (especially exposure to cold snaps), planting at the wrong time of year for your climate, or stress on the plant.
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Harvesting Signs: Onions are typically ready to harvest when the tops naturally begin to fall over. At this point, you can gently loosen the soil around the bulb to encourage further drying before fully harvesting.
In summary, focus on providing proper care, such as adequate watering and fertilization, to encourage healthy bulb growth naturally, and avoid topping unless your onions have bolted, in which case harvesting is the best option.
