The short checklist
- Type: Buy short-day onions for North Texas (or southern-labeled intermediate types).
- When: Cool-season plantings - follow short-day guidance for fall through late winter/early spring methods.
- Sun: Full sun.
- Soil: Loose, fertile, weed-free.
- Water: Steady while growing; ease as tops fall if curing.
- Harvest: Tops yellow/fall for storage bulbs; cure in shade with airflow.
How to actually do this
The number one onion mistake in Texas is planting long-day varieties that never get the daylength signal to bulb properly. Get short-day (or recommended southern) types. Full sun, keep weeds down, water steadily, harvest when tops go down for storage bulbs. Use thick-necked early pulls as fresh onions.
Top ways people mess this up
- Long-day varieties from northern seed racks.
- Weedy beds.
- Leaving mature bulbs in wet soil - rot city.
Field notes
- Daylength sensitivity is non-negotiable: short-day for deep South bulb initiation.
- Onions are weak weed competitors - bed hygiene is yield.
- Steady water during bulbing; excess late wet invites rot.
- Cure properly or do not bother storing.
- Sets vs transplants vs seed: speed vs cost vs variety access.
Crop biology
Allium cepa bulbing is photoperiod- and temperature-linked. Short-day cultivars initiate bulbs under shorter daylengths suitable for southern latitudes. Front-load fertility; late high N can delay maturity.
Failure mode
Buying whatever sets are cheapest without daylength class is how you grow scallions with ambition.
Sun / soil / water / feed
Sun: full 6-8+ hours. Soil: loose fertile drained; no fresh manure; raised beds help on clay. Water: even through vegetative and bulbing; reduce as tops fall if curing. Feed: moderate; N earlier rather than late heavy shots.
Dallas timing
- Plant in the cool-season window appropriate to method and short-day cultivar guidance for North Texas.
- Harvest storage bulbs as tops fall and dry down.
- Cure in shaded airflow until necks dry.
Extras / pests / harvest
Keep rows clean. Pull thick-neck bulbs for fresh use if they will not store. Thrips and weeds are common issues. Lift gently; store only sound dry-neck bulbs cool and dry.
Unit close
Short-day genetics, full sun, weed-free, steady water, cure. Daylength is not a suggestion.