Harvesting Onions

Onion harvest timing depends on whether the crop will be used fresh or cured for storage. Bulbing onions intended for storage are generally harvested after the tops naturally bend over and begin drying, while green onions can be harvested much earlier.

Know Which Type You Are Growing

Green onions, bunching onions, sweet onions, and long-storage bulb onions are harvested at different stages.

Harvest Green Onions Early

Scallions and bunching onions can be pulled once they reach a useful size.

Harvest Fresh Bulb Onions Before Full Maturity

Bulbs intended for immediate use can be harvested while tops are still relatively green.

Watch Tops on Storage Onions

As bulbs mature, leaves naturally yellow, weaken, and fall over near the neck.

Do Not Force Tops Down

Artificially bending healthy leaves does not improve maturity and may injure the neck.

Check the Whole Planting

Not every onion matures on the same day, so evaluate the overall bed rather than one early plant.

Harvest Mature Bulbs in Dry Weather

Dry soil and foliage make lifting and curing easier.

Reduce Irrigation Near Maturity

When most tops are naturally declining, excessive watering can complicate harvest and curing.

Loosen Soil Before Pulling

Use a fork in heavy soil so necks are not torn while lifting bulbs.

Lift Bulbs Gently

Avoid jerking or throwing onions because fresh bulbs bruise easily.

Do Not Cut Into Bulbs

Fork and shovel wounds shorten storage life and create entry points for decay.

Leave Tops Attached

Storage onions should retain their leaves and necks during curing.

Leave Roots Attached Initially

Roots can be trimmed once curing is complete.

Brush Off Loose Soil

Remove dry soil gently without stripping protective outer scales.

Avoid Washing Storage Onions

Bulbs intended for curing are generally kept dry after harvest.

Move Bulbs to Shade

Strong sunlight and heat can damage freshly harvested onions.

Begin Curing Promptly

Place storage onions in a dry, well-ventilated location protected from rain.

Spread Bulbs Thinly

Good airflow around bulbs and necks helps moisture escape.

Separate Damaged Onions

Use cut, bruised, split, or soft bulbs first rather than storing them long term.

Inspect for Neck Rot

Softness, mold, unusual discoloration, or foul odors around the neck can indicate decay.

Harvest Sweet Onions With Different Expectations

Mild sweet varieties often have shorter storage life than pungent storage types.

Do Not Expect Every Variety to Store Equally

Cultivar genetics strongly influence dormancy and storage potential.

Cure Before Long-Term Storage

Wait until necks, skins, and roots are thoroughly dry before trimming.

Trim Tops After Curing

Once dry, foliage can be removed while leaving enough neck tissue to protect the bulb.

Trim Dry Roots

Roots can be shortened without cutting into the basal plate.

Grade Bulbs Before Storage

Keep the firmest, healthiest onions for longest storage and use marginal bulbs sooner.

Label Varieties

Keeping cultivars separate makes it easier to compare maturity and storage performance.

Record Harvest Dates

Year-to-year records help refine timing under local conditions.

Harvest Bulbs Individually if Maturity Is Uneven

Some onions may finish earlier than others because of differences in variety, soil moisture, plant spacing, or sunlight. Lift mature bulbs first and leave clearly greener plants growing a little longer.

Check Neck Condition

A maturing storage onion develops a softer, narrowing neck as foliage declines. Thick green necks usually indicate that the plant has not finished maturing.

Watch for Bulbs Exposed Above the Soil

Onion bulbs naturally enlarge partly above the soil surface. Avoid hilling soil heavily over mature bulbs because keeping them excessively wet can interfere with drying.

Protect Harvested Bulbs From Rain

If wet weather is expected after lifting, move onions promptly under cover instead of leaving them exposed in the garden.

Keep Harvest Lots Separate

Separate storage onions from sweet onions, damaged bulbs, and immature bulbs because each group has different curing and storage potential.

Practical Takeaway

Harvest storage onions when tops naturally decline and necks begin drying. Lift bulbs gently, keep tops attached during curing, protect the crop from rain, and separate damaged onions from those intended for storage.