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Spring onions are ready to pick when their bulbs reach about the size of a dime to a quarter, typically 60 to 90 days after planting.
If you’ve been wondering exactly when are spring onions ready to pick, the answer comes down to a mix of time, size, and visual cues you can spot easily.
Knowing when are spring onions ready to pick ensures you harvest them at that sweet, mild stage before they turn into stronger-tasting bulb onions.
In this post, we’ll dig into the signs that tell you when spring onions are ready to pick, how to check for readiness, and tips for getting the best harvest.
Let’s get those green tops and tender bulbs out of the ground at the perfect moment.
When Are Spring Onions Ready to Pick: The Simple Answer
The clearest answer to when are spring onions ready to pick is based on bulb size and leaf growth rather than a strict calendar date.
Spring onions are essentially immature onions, so you’re aiming to pull them while the bulb is still small and the greens are lush and upright.
Most gardeners find that spring onions are ready to pick about two to three months after sowing seeds, but this timeline shifts if you started with sets or transplants.
The real trick is to start checking your plants regularly once the tops reach about 12 to 18 inches tall, because that’s usually when the bulbs are forming underneath.
So, when are spring onions ready to pick in your specific garden?
You’ll know it’s time when the bulb has swelled just above the soil line and still feels firm, not woody or split.
1. Size Is Your Best Guide for When Spring Onions Are Ready to Pick
When spring onions are ready to pick, the bulb will typically measure between a quarter and a half inch across, though some varieties can get slightly larger.
If you prefer baby spring onions with a delicate flavor, you can harvest even earlier than that, when the bulb is just a pencil-thick swelling.
Conversely, if you wait too long past this size window, the bulbs start to mature into full onions, which changes the taste and texture dramatically.
So keep a close eye on that bulb diameter because that single measurement answers when are spring onions ready to pick more reliably than any other factor.
2. Leaf Color and Health Signal When Spring Onions Are Ready to Pick
Healthy, vibrant green tops that stand tall and crisp are a strong indicator that spring onions are ready to pick.
When spring onions are ready to pick, the leaves should not be yellowing, wilting, or flopping over, as those signs often mean the plant is shifting energy to seed production.
If the green tops start to fall over at the tips, that’s usually a signal that the bulb has stopped growing and the plant is maturing past the spring onion stage.
You want to catch them just before any leaf die-back begins, so check the foliage each day once you think spring onions are ready to pick.
3. Feel the Soil to Determine When Spring Onions Are Ready to Pick
Gently brush away a little soil from the top of the bulb to see how much it has swollen, which is a direct way to assess when spring onions are ready to pick.
If the bulb feels round and plump with a slight give, you’re in the ideal harvest window for when spring onions are ready to pick.
On the other hand, if the bulb feels hard and the neck looks thick and dry, you’ve missed the spring onion stage and should treat them as storage onions instead.
Do this soil check every few days, especially after a rain, because moisture can speed up bulb growth and shift when spring onions are ready to pick.
How to Harvest Once You Know When Spring Onions Are Ready to Pick
Once you’ve confirmed when spring onions are ready to pick, harvesting them is quick and easy with the right technique.
You don’t need fancy tools, just a hand fork or even your fingers if the soil is loose enough.
Loosen the soil around each plant first to avoid snapping the bulb, then grip the base of the leaves and pull gently upward.
If the soil is compacted, water the area an hour before harvesting because moist dirt releases the roots much more smoothly.
1. Harvest in the Morning for the Best Flavor
The best time of day to harvest when you’ve determined when spring onions are ready to pick is early morning.
At that point, the plants are fully hydrated and crisp, which makes them taste sweeter and store longer after picking.
Avoid pulling them in the heat of the afternoon because the leaves can wilt quickly and lose that fresh bite.
Morning harvest also gives you time to clean and use or store them before the sun stresses the cut areas.
2. Cut or Pull? Both Work Once Spring Onions Are Ready to Pick
You can either pull the entire plant or cut it at soil level when spring onions are ready to pick, depending on whether you want the bulb too.
If you only need the green tops for salads or garnishes, cutting the leaves about an inch above the bulb allows the plant to regrow another flush.
If you want both the tender bulb and the greens, pull the whole plant so you use every edible part.
Either method works fine, but whole-plant harvest gives you the classic spring onion shape with the tiny white bulb and long green shanks.
3. Storing Your Harvest After Spring Onions Are Ready to Pick
After you’ve harvested at the point when spring onions are ready to pick, you should use them within a week for peak freshness.
Store unwashed spring onions in a plastic bag in the fridge’s crisper drawer, where they’ll stay crisp for about five to seven days.
You can also stand them upright in a glass with an inch of water and cover the greens loosely with a bag, just like fresh flowers.
If you have a big harvest, chop the bulbs and greens and freeze them in a single layer, though they’ll lose some crunch after thawing.
Common Mistakes That Throw Off When Spring Onions Are Ready to Pick
Even experienced gardeners sometimes misjudge when spring onions are ready to pick due to a few easy-to-make errors.
Let’s look at the biggest blunders so you don’t pull too early or too late.
1. Waiting for a Large Bulb Before Checking When Spring Onions Are Ready to Pick
One of the most common mistakes is waiting for the bulb to get big like a regular onion, but that’s not when spring onions are ready to pick.
Spring onions are meant to be harvested young, and if you let them grow into full onions, you lose that mild, sweet flavor entirely.
The moment the bulb exceeds roughly an inch in diameter, the plant has moved past the spring onion stage.
So resist the urge to wait too long and start pulling as soon as the bulb is noticeably thicker than the stem.
2. Planting Too Close Together, Which Delays When Spring Onions Are Ready to Pick
If you sow seeds too densely, the plants compete for nutrients and water, which slows growth and throws off when spring onions are ready to pick.
Crowded onions produce thin, spindly bulbs that may never fatten up to that harvest-ready size.
Thin your seedlings to about two to three inches apart so each plant gets enough room to swell its bulb.
Proper spacing speeds up development and makes it much easier to spot when spring onions are ready to pick.
3. Ignoring Variety Differences When Figuring Out When Spring Onions Are Ready to Pick
Different spring onion varieties mature at slightly different rates, so the answer to when spring onions are ready to pick varies a bit by type.
White Lisbon, for example, is a classic fast grower that’s often ready in as little as 60 days.
Red varieties like Red Baron might take a few extra days to reach that same bulb size.
Check your seed packet for days to maturity, then start observing the size and leaf cues around that timeframe to nail when spring onions are ready to pick.
So, When Are Spring Onions Ready to Pick in Your Garden?
Spring onions are ready to pick when the bulbs are about the size of a quarter, the tops are still green and upright, and roughly 60 to 90 days have passed since sowing.
So, when are spring onions ready to pick?
That’s the moment those small, firm bulbs peek just above the soil while the leaves stand tall and crisp, which means you haven’t waited too long.
When spring onions are ready to pick, you’ll enjoy the mild, fresh taste that makes them perfect for salads, stir-fries, and garnishes.
By checking size, leaf health, and bulb firmness, you can harvest at that ideal stage every single time.
Now that you know when spring onions are ready to pick, head out to the garden and see if your crop is saying hello to harvest time.
Happy picking!