Onion tops falling over: stop watering and lift

Tops falling over are the usual sign that bulbs have reached full size. Letting the soil dry now helps the bulbs mature for storage.

When we suggest this

• Your noteYou noted the stage: tops falling over.

What would stop us suggesting it

• If it's still open after its window, it shows as overdue for up to 2 weeks, then closes.
• When you mark it Done or Doesn't apply. "Doesn't fit my setup" stops it for that plant this season.

What to do

1. Stop watering now so the bulbs can finish in drier soil.
2. When about half or more of the tops are down and turning yellow, loosen the soil with a garden fork and lift the bulbs.
3. Leave the tops on for now. They help the necks dry during curing.

What we can't know

• How many of your onion tops are down so far.
• Whether your onions are a storage type or a sweet type that keeps only a few weeks.

Sources differ on when to lift: when about half the tops are down (Minnesota), two-thirds (Maryland), most (Iowa State), or 70–80% (UC). For the longest storage, a commercial source suggests lifting while 30–40% are still upright (UMass). Some sources stop watering 7–14 days before harvest instead of at the first fallen tops.

Where this advice applies

All US regions.

Any US garden growing bulb onions.

In the low desert and other mild-winter areas, bulb onions are often planted in fall and lifted in spring. Spring-planted onions usually take about 3–4 months to mature.

Exceptions

• Green onions or scallions you pick young.
• Plants you've marked finished.

Reviewed

Sources checked Sept 2026 · awaiting expert review

Gardenplanner research (AI-assisted), pending extension-qualified review

Rule id and version: onion.tops-falling@1