Onions Not Bulbing Up
Stem & Roots problem · common pattern reported by gardeners · verify locally
What you'll see
- Thick tops, small bulbs
- Late bulbing
- Soft necks
Most common causes
- Day-length mismatch (wrong variety for latitude)
- Too much nitrogen
- Overcrowding
- Planting too late
How to fix it
- Harvest as scallions if too late
- Stop nitrogen once bulbing starts
Prevention: Choose day-length type for your latitude Plant sets early Space 4 in apart
More Onion problems
Grow Onion with confidence
Open the Onion growing guide → · Planting calendar · Pest & problem diagnoser
ZoneFig content reflects widely published extension-service and gardening guidance. Symptoms and causes are common patterns, not a diagnosis for any individual plant — verify locally and treat conservatively.