Grown Yellow Sweet Spanish Onion?

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Yellow Sweet Spanish Onion — Onions & alliums

110-120days to harvest

7-14days to germinate

Z5–10USDA zones

Easydifficulty

HeirloomContainer friendly

Sowing

Start seeds indoors 10-12 weeks before last frost, or plant sets in early spring when soil can be worked.

Cultivation

Sun: Full sun (6+ hours)
Water: 1 inch per week, consistent moisture during bulb development
Soil: Loose, well-drained soil rich in organic matter
Soil pH: 6.0-7.0
Spacing: 4-6 inches
Height: 12-18 inches
Season: Cool season

Appearance & flavour

Colour: Golden yellow skin with white flesh
Size: 3-5 inches diameter, 8-16 oz
Shape: Large, round to slightly flattened globe
Flavour: Sweet and mild with low sulfur content

In the kitchen

Excellent fresh in salads, sandwiches, grilling, roasting, and general cooking. Good storage onion.

Pests, disease & resistance

Pests: Onion thrips, onion maggot, cutworms
Diseases: Downy mildew, purple blotch, white rot
Resistance: Good resistance to pink root and fusarium basal rot

Planting calendar by USDA zone

Zone	Start indoors	Transplant	Direct sow	Harvest
1	—	—	June – July	September
2	—	—	May – July	September
3	—	—	May – June	August – October
4	—	—	April – June	August – October
5	—	—	April – May	August – November
6	—	—	April – May	July – November
7	—	—	March – May	July – November
8	—	—	March – April	June – December
9	—	—	February – March	May – December
10	—	—	January – March	May – December
11	—	—	January – February	April – December
12	—	—	January – February	April – December
13	—	—	January – February	April – December

Companion planting

8 beneficial pairings indexed for this variety, 3 to avoid.

CarrotsOnions repel carrot fly while carrots help break up soil for onion bulb development

TomatoesOnions deter aphids, whiteflies, and hornworms that commonly attack tomatoes

CabbageOnions repel cabbage worms, cabbage loopers, and flea beetles

LettuceOnions provide pest protection while lettuce doesn't compete for space with shallow roots

PeppersOnions deter aphids and spider mites that target pepper plants

BroccoliOnions repel cabbage family pests including cabbage maggots and aphids

SpinachOnions protect spinach from leaf miners and aphids while maximizing garden space

StrawberriesOnions deter slugs, aphids, and nematodes that damage strawberry plants

Avoid

BeansOnions inhibit nitrogen fixation in bean roots and can stunt bean growth

PeasOnions interfere with nitrogen fixation and root nodule development in pea plants

AsparagusBoth compete for similar soil nutrients and onions can inhibit asparagus spear development

Nutrition (per 100 g)

Calories (per 100 g): 40
Protein (g): 1.1
Fat (g): 0.1
Carbohydrate (g): 9.34
Fibre (g): 1.7
Sugars (g): 4.24
Vitamin A (µg): 0
Vitamin C (mg): 7.4
Vitamin E (mg): 0.02
Vitamin K (µg): 0.4
Vitamin B6 (mg): 0.12
Folate (µg): 19
Calcium (mg): 23
Iron (mg): 0.21
Magnesium (mg): 10
Phosphorus (mg): 29
Potassium (mg): 146
Zinc (mg): 0.17
Selenium (µg): 0.5

← PreviousFrench Gray Shallot Next →Italian Red Torpedo Onion

Where to buy seed and equipment

Some links are affiliate links. If you buy through them we may earn a commission at no extra cost to you.

Growing it? There is a full cultivation guide at the onions & alliums growing guide.

Cultivar facts compiled from public horticultural references including USDA GRIN and NC State Extension. Descriptions are original to this catalogue.

Sowing

Cultivation

Appearance & flavour

In the kitchen

Pests, disease & resistance

Planting calendar by USDA zone

Companion planting

Avoid

Nutrition (per 100 g)

Where to buy seed and equipment

Grown Yellow Sweet Spanish Onion?

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