You can harvest young onions just a few weeks after planting if you want to use them as “spring onions” or scallions. When your plants reach at least seven leaves, you … You need to know how to read your homegrown onions in order to properly harvest them.. They're one of the best onions for eating raw because of their mild flavor. If you have a spading fork, use it to loosen the soil around and under the bulbs. When your plants reach at least seven leaves, you … When half of the tops of onions start to dry out and fall over on the soil they are ready to harvest. One way you can tell your onion plants are nearing harvest is to count the number of leaves on your onions. Here is a quick and easy guide on how to harvest and cure onions. There is no perfect size, just pull when they are big enough to suit you. As your onion bulbs grow larger, their flavor and scent gets stronger. Just as you do with globe onions, watch for the tops to flop, then stop watering for several days. Watch and learn helpful tips and techniques on how to harvest spring onions. You can always tell when onions have stopped growing. There's never a time when onions aren't ready for harvesting. It is hard to know when they are ready because they grow out of sight. How do you know when shallots are ready for harvest? Harvest the Onions Red onions grown for bulbs usually require three to four months to reach maturity while green onions are ready to pick in as little as three weeks. Harvest them when they’re about 6 inches above the soil. Above is a yellow onion that is ready to harvest. While 13 leaves is a “perfect” onion, some varieties may mature with fewer leaves than that are still perfectly good onions. When onions are done, they’ll tell you. Red onions add a festive touch to salads and other dishes. If you want to harvest green onions, you’ll just have to wait for about a month until they’re ready to be picked. While 13 leaves is a "perfect" onion, some varieties may mature with fewer leaves than that are still perfectly good onions. They have a sweet, mild taste and crispy texture. One way you can tell your onion plants are nearing harvest is to count the number of leaves on your onions. Fully mature onions have the best flavor and storage life. When to Harvest. Knowing when to harvest your onions can be a tricky question. Shallots mature in about 90 days and are ready to be picked in mid to late summer when their leaves start to turn brown and fall over. How to Tell When Onions Are Ready for Harvest. Nature gives us answers if you know where to look. No matter how many onions you use during the season, though, it's nice to have a crop of big onions mature at the end of summer to store for the fall and winter months. The neck breaks and they flop over. You may be inclined to wait just a little longer for the shoots to grow taller, but this isn’t advisable. They can be picked and eaten at any stage. For the best flavor and crispness, it's important to harvest your red onions at the right time. They are ready to harvest when the bulbs are big and the tops begin to turn yellow and fall over. Red onions have reddish purple skin and rings of white flesh. However, if you just know what to look for, like your shoots turning brown or yellow and falling over, you will be on the road to having a very successful onion crop. For full-sized bulbs, let onions grow and mature. Onions are one of the many vegetables that are relatively easy to grow, especially when planting them using sets.. One thing that is easier than growing onions and harvesting them. Curing onions takes a little more work, but it’s a breeze. Here’s a red onion doing the same thing: Time to harvest red onions.