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Sweet onions are ready to pick when their tops begin to flop over and dry out at the neck, which typically happens 90 to 120 days after planting.
If you’ve ever stood in your garden staring at a row of green stalks and wondered when are sweet onions ready to pick, you’re not alone.
Knowing when are sweet onions ready to pick comes down to reading a few clear visual cues that signal the bulb has fully matured.
The good news is that sweet onions give you plenty of hints, so you don’t have to guess when are sweet onions ready to pick.
In this post, we’ll walk through the exact signs that tell you sweet onions are ready to pick, how to confirm with a simple touch test, and what to do after you pull them so they store beautifully.
Let’s dig into the details and make sure you harvest at the perfect moment.
When Are Sweet Onions Ready to Pick: The Key Signs
Sweet onions are ready to pick when the foliage signals that growth has stopped, and there are several reliable indicators to watch for.
The most obvious sign that sweet onions are ready to pick is when the green tops start to fall over naturally.
This isn’t a sign of disease or stress, it’s the plant’s way of saying the bulb has reached full size and the energy is now focused below ground.
Here’s what to look for so you know when are sweet onions ready to pick in your own patch.
1. The Tops Flop Over Softly
About halfway through the growing season, you’ll notice the tall, upright green leaves begin to bend near the top.
When you see about half to two-thirds of the tops flopping over, that’s a strong clue that sweet onions are ready to pick.
The neck of the onion softens, and the leaf structure loses its rigid posture.
If most of your onion tops are still standing straight as boards, give them more time because sweet onions are not ready to pick yet.
Wait until the majority have fallen over, and then you can start harvesting over the next week or two.
2. The Neck Begins to Soften and Dry
Another indicator that tells you when sweet onions are ready to pick is the neck area just above the bulb.
Gently squeeze that region, and if it feels soft and slightly squishy rather than rigid and thick, the onion is maturing.
A thick, firm neck usually means the onion is still actively growing and will keep putting energy into the leaves rather than the bulb.
Sweet onions are ready to pick when that neck has softened enough that you can bend it without much resistance.
This is your plant’s way of preparing for dormancy, which is exactly what you want before harvest.
3. The Bulb Pokes Above the Soil
When are sweet onions ready to pick also depends on how much of the bulb you can see above the dirt line.
As the onion matures, the top of the bulb will push upward and become visible on the soil surface.
If you can see a nice, rounded shoulder peeking out, that’s a fantastic sign that the bulb has sized up.
Brush away a bit of soil gently to check the diameter, and if it feels plump and firm, your sweet onions are ready to pick.
Onions that remain buried deep with no visible bulb are still bulking up, so just leave them in the ground a bit longer.
4. Count the Days Since Planting
While visual cues are the best answer to when are sweet onions ready to pick, the calendar can give you a rough estimate.
Sweet onion varieties like Vidalia, Walla Walla, and Texas Sweet typically need around 100 days from transplanting.
If you planted sets or seeds, add extra time because seeds take longer to mature than transplants.
Keep a garden journal or set a reminder at about 85 days, then start inspecting your onions daily.
The combination of time and physical signs will give you the most accurate sense of when are sweet onions ready to pick.
How to Test If Sweet Onions Are Ready to Pick
Sometimes, you look at the tops and they still look green, but you’re just not sure if sweet onions are ready to pick.
That’s where a quick physical test comes in handy, and it takes less than a minute to perform.
Here are two simple methods to confirm that your sweet onions are ready to pick without pulling them too early.
1. The Gentle Loosen Test
Dig your fingers into the soil around the base of one onion and wiggle it slightly.
If the bulb feels loose and moves easily in the soil, that’s a clue that sweet onions are ready to pick.
A bulb that’s still holding tight to the roots is still growing, so it needs more time in the ground.
Don’t yank hard, just test one or two bulbs and leave the rest undisturbed if they don’t budge.
2. Check the Skin Color and Texture
Pull back a tiny bit of the outer papery skin on one onion to see what’s underneath.
When sweet onions are ready to pick, the skin should be dry, papery, and slightly golden or bronze in color.
If the skin is still wet, thick, or translucent, the onion hasn’t cured yet and isn’t fully mature.
This test is a bit invasive, so do it on an onion you plan to eat soon anyway.
It gives you a definitive answer about when are sweet onions ready to pick across your whole bed.
What Happens If You Pick Sweet Onions Too Early or Too Late
Timing matters because sweet onions are ready to pick during a fairly narrow window of optimal ripeness.
If you harvest too early, the bulbs will be smaller, milder, and they won’t store well because their necks are still thick and moist.
If you wait too long after sweet onions are ready to pick, the bulbs can split, rot in wet soil, or start sprouting again.
Overripe sweet onions also develop a stronger, more pungent flavor that defeats the purpose of growing sweet varieties.
So when you notice those signs that sweet onions are ready to pick, plan to harvest within a week or so.
That window gives you the perfect balance of sweetness, size, and storage potential.
How to Harvest and Cure Sweet Onions After They’re Ready to Pick
Once you’ve confirmed that your sweet onions are ready to pick, the work isn’t over just yet.
Proper harvesting and curing will make a huge difference in how long they last in your kitchen.
Here’s how to handle your onions once you know they’re ready to pick.
1. Loosen the Soil Before Pulling
Use a garden fork or trowel to gently loosen the soil around each bulb before you pull.
This prevents tearing the roots or bruising the bulb, which can lead to rot later.
Grasp the tops near the base and pull steadily, then shake off excess soil.
If the weather is dry and sunny, leave the onions on the soil surface for a day to start drying.
2. Cure in a Warm, Airy Spot
After your sweet onions are ready to pick and pulled, curing is essential for long-term storage.
Lay them out in a single layer in a warm, dry, well-ventilated area out of direct sun.
Leave the tops attached during curing so the neck can dry out slowly and seal properly.
After two to three weeks, the skins will be papery and the necks will feel fully dry.
Then you can trim the roots and cut the tops down to about an inch above the bulb.
3. Store in a Cool, Dry Place
Sweet onions don’t store as long as pungent storage onions because they have higher water and sugar content.
Keep cured sweet onions in a mesh bag, basket, or pantyhose in a cool, dark, dry spot with good airflow.
Check them regularly and remove any that show soft spots or sprouting to protect the rest.
With proper curing, you can enjoy your homegrown sweet onions for several months.
So, When Are Sweet Onions Ready to Pick?
Sweet onions are ready to pick when the tops flop over, the necks soften, and the bulbs push above the soil line.
That combination of visual cues, plus the calendar check, tells you exactly when are sweet onions ready to pick in your garden.
Don’t rush the process, and don’t wait too long, either, because the harvest window is fairly short.
Once you notice those tops falling and the bulbs feeling plump, get out there and pull them on a sunny morning.
Cure them properly, store them well, and you’ll have sweet, homegrown onions that taste far better than anything from the store.
Now that you know when are sweet onions ready to pick, you can harvest with total confidence and enjoy the fruits of your labor.