Troubleshooting
'Walla Walla' Onion problems — and how to fix them
'Walla Walla' Onion (Allium cepa 'Walla Walla') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Bolting (premature flowering)
Overwintered plants that experience prolonged cold or a stress check run to seed, producing a woody central stalk and poor bulbs. Sow at the right time and choose recommended sowing windows.
Poor storage / rot
Sweet, high-moisture, thin-skinned bulbs keep only a few weeks. Cure thoroughly in a dry, airy place and use promptly; they are not a long-keeping onion.
Onion white rot
Soil-borne fungus causing yellowing tops, fluffy white mycelium, and rotting bulb bases. It persists for years, so practise long rotations and never plant into known-infected ground.
Onion fly / thrips
Onion fly maggots tunnel into bulbs while thrips silver the foliage and check growth. Use insect mesh against onion fly and keep plants well-watered to limit thrips damage in hot spells.
Prevent 'walla walla' onion problems before they start
Most 'walla walla' onion issues are care-mismatch, not bad luck. Dial in the basics:
- Common onions problems — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- 'Walla Walla' Onion watering schedule
- 'Walla Walla' Onion light requirements
- Best soil mix for 'walla walla' onion
- 'Walla Walla' Onion temperature & humidity
- Full 'walla walla' onion care guide
Looking for 'walla walla' onion in general rather than its problems? Read the full 'walla walla' onion care guide — light, water, soil and feeding.
'Walla Walla' Onion problems — FAQ
Why is my 'walla walla' onion bolting (premature flowering)?
Overwintered plants that experience prolonged cold or a stress check run to seed, producing a woody central stalk and poor bulbs. Sow at the right time and choose recommended sowing windows.
Why is my 'walla walla' onion poor storage / rot?
Sweet, high-moisture, thin-skinned bulbs keep only a few weeks. Cure thoroughly in a dry, airy place and use promptly; they are not a long-keeping onion.
Why is my 'walla walla' onion onion white rot?
Soil-borne fungus causing yellowing tops, fluffy white mycelium, and rotting bulb bases. It persists for years, so practise long rotations and never plant into known-infected ground.
Why is my 'walla walla' onion onion fly / thrips?
Onion fly maggots tunnel into bulbs while thrips silver the foliage and check growth. Use insect mesh against onion fly and keep plants well-watered to limit thrips damage in hot spells.