How to Grow Italian Red Torpedo Onion
Allium cepa 'Italian Red Torpedo'
Italian Red Torpedo onions are a popular heirloom variety prized for their mild flavor and long storage life. Gardeners grow these compact bulbs to add color and culinary versatility to cool-season gardens or containers throughout the growing season.
📷 Wikipedia: OnionStarting Italian Red Torpedo Onion: indoors or direct sow?
🌾 Sow directly in the garden — Italian Red Torpedo Onion is not usually started indoors.
You can start seeds indoors 4 to 6 weeks before the last frost or direct sow them outdoors during this same period.
Soil, care & harvest
Prepare loose, well-draining soil with a pH between 6.0 and 7.0 for best results. As a cool-season crop, you should sow seeds indoors 4-6 weeks before your last spring frost or plant them directly outdoors during this same window. Press seeds lightly into the soil at a depth of about half an inch to ensure consistent germination within 7 to 14 days.
Space seedlings 4 to 5 inches apart once they emerge to allow proper bulb development. Keep the soil consistently moist, providing about one inch of water per week, but reduce watering as harvest approaches. Apply a light mulch to retain moisture and suppress weeds, though these onions generally do not require staking or trellising.
Watch for onion thrips, onion fly, and wireworms; practice crop rotation and remove infected plants early to manage them. Prevent neck rot, downy mildew, and bacterial soft rot by ensuring good air circulation and avoiding overhead watering. Harvest bulbs when they are dry and papery after 95-110 days from sowing.
When to Plant Italian Red Torpedo Onion
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 1 | — | June – July | September |
| Zone 2 | — | May – July | August – September |
| Zone 3 | — | May – June | August – October |
| Zone 4 | — | April – June | August – October |
| Zone 5 | — | April – May | July – November |
| Zone 6 | — | April – May | July – November |
| Zone 7 | — | March – May | June – November |
| Zone 8 | — | March – April | June – December |
| Zone 9 | — | February – March | May – December |
| Zone 10 | — | January – March | April – December |
| Zone 11 | — | January – February | March – December |
| Zone 12 | — | January – February | March – December |
| Zone 13 | — | January – February | March – December |
Companion Plants for Italian Red Torpedo Onion
✓ Good companions
Onions repel cabbage worms, flea beetles, and other brassica pests
Onions repel carrot flies while carrots help break up soil for onion bulb development
Onions provide pest protection without competing for nutrients, lettuce fits between onion rows
Both repel nematodes and various garden pests, creating enhanced protection
Onions repel aphids and may improve pepper growth and flavor
Compatible growth habits and onions provide pest protection for leafy greens
Onions deter slugs, aphids, and other strawberry pests
Onions deter aphids, spider mites, and tomato hornworms from tomato plants
✗ Keep away from
Onions can stunt asparagus growth and reduce spear production
Onions can inhibit bean growth and nitrogen fixation by rhizobia bacteria
Onions stunt pea growth and interfere with their nitrogen-fixing capabilities
Can inhibit onion growth through allelopathic compounds
Nutrition Facts
Per 100g serving (USDA FoodData Central)
