🧅 Onion Allium cepa
🥬 Vegetable 🧬 Onion family (Alliums)
Companion plants for Onion (Vegetable): good neighbours to grow together, plants it dislikes, and sowing tips. EkoHarita — Dünya varmış!
🌿 Open in the Interactive Chart
Good Companions — Plant Together
Bad Neighbours — Keep Them Apart
Conflicting Neighbours
Growing & Sowing Tips
📅 SowingStart as seedlings indoors between February and April; move outdoors after the last frost. For direct sowing, April-May.
🌱 Depth1-2 cm
📏 Spacing10-15 cm
🌞 SunFull sun
💧 WateringRegular watering; the soil shouldn't dry out but there should be no standing water
🧺 HarvestAbout 100-120 days after sowing; when roughly 50-80% of the leaves yellow and the neck softens and falls over, the onions are mature and ready to harvest (collect within 1-2 weeks after the neck softens). If an onion bolts early (sends up a flower stalk) it should be harvested at once, as those onions cannot be stored long.
🪴 SoilLight, well-draining, nutrient-rich soil; pH 6.0-7.0
⭐ DifficultyEasy
🗓️ SeasonSpring/Summer
📅 Calendar is for the Northern Hemisphere; in the Southern Hemisphere shift sowing times by ~6 months.
💡 Key tip: If an onion sends up a flower stalk (bolts), bulb growth stops and energy goes to seed; pinching off the flower/stalk won't reverse the bolting or grow the bulb. So harvest flowering onions promptly and use them fresh (bolted onions don't store well). Stop watering in the last 1-2 weeks before harvest; cure (rest) the lifted onions for 2-3 weeks in a dry, airy place.
🤝 Companion logic: Planted together with carrot, their pungent scents confuse and drive off each other's pests (the onion fly and the carrot fly). Onion also repels the pests of brassicas (cabbageworm, cabbage fly) and of lettuce/beet/strawberry (aphids); however, some sources note that the onion's volatile oils can negatively affect cabbage growth/flavour, so leave a gap from cabbage. Keep it away from pea, bean and other legumes (onion hinders the legumes' root bacteria and stops their growth); don't plant it next to other alliums like leek and garlic (shared pest/onion-fly risk).
🔬 Scientific References
- Royal Horticultural Society (t.y.) Allium cepa (onion). Erisim adresi: https://www.rhs.org.uk/plants/101270/allium-cepa/details (Erisim: 15 Haziran 2026).
- University of Minnesota Extension (t.y.) Growing onions in home gardens. Erisim adresi: https://extension.umn.edu/vegetables/growing-onions (Erisim: 15 Haziran 2026).
- University of Maryland Extension (2026) Growing Onions in a Home Garden. Erisim adresi: https://extension.umd.edu/resource/growing-onions-home-garden (Erisim: 15 Haziran 2026).
- Andersen, C. (t.y.) Onions (Home Gardening Series), FSA6014. University of Arkansas Cooperative Extension Service. Erisim adresi: https://www.uaex.uada.edu/publications/PDF/FSA-6014.pdf (Erisim: 15 Haziran 2026).
- University of Illinois Extension (t.y.) Onion (Allium cepa) - Hort Answers. Erisim adresi: https://web.extension.illinois.edu/hortanswers/plantdetail.cfm?PlantID=291&PlantTypeID=9 (Erisim: 15 Haziran 2026).
- North Carolina State Extension (t.y.) Allium cepa (Green onion, Onion, Onions, Scallion, Shallot, Spring onion). NC Extension Gardener Plant Toolbox. Erisim adresi: https://plants.ces.ncsu.edu/plants/allium-cepa/ (Erisim: 15 Haziran 2026).
- West Virginia University Extension (t.y.) Companion Planting. Erisim adresi: https://extension.wvu.edu/lawn-gardening-pests/gardening/garden-management/companion-planting (Erisim: 15 Haziran 2026).
- The Old Farmer's Almanac (t.y.) Onion Companion Plants: Best Plants to Grow with Onions. Erisim adresi: https://www.almanac.com/companion-plants-for-onions (Erisim: 15 Haziran 2026).
- West Coast Seeds (t.y.) Companion Planting. Erisim adresi: https://www.westcoastseeds.com/blogs/wcs-academy/companion-planting (Erisim: 15 Haziran 2026).
- Sulvai, F., Chauque, B.J.M. ve Macuvele, D.L.P. (2016) 'Intercropping of lettuce and onion controls caterpillar thread, Agrotis ipsilon major insect pest of lettuce', Chemical and Biological Technologies in Agriculture, 3, makale 28. doi:10.1186/s40538-016-0079-z
- Albayrak, B. ve Elmaci, O.L. (2017) 'Soganda (Allium cepa L.) azot ve kukurt uygulamalarinin verim ve bazi kalite kriterleri uzerine etkisinin belirlenmesi', Bahce, 46(1), s. 21-30. Erisim adresi: https://dergipark.org.tr/tr/pub/bahce/article/443528 (Erisim: 15 Haziran 2026).
- Arikan, N. ve Kadioglu, I. (2023) 'Amasya ve Tokat Illeri Sogan Ekim Alanlarinda Sorun Olan Yabanci Ot Turlerinin Yogunluklarinin ve Rastlama Sikliklarinin Belirlenmesi', Turkish Journal of Weed Science, 26(3), s. 261-273. Erisim adresi: https://dergipark.org.tr/en/pub/tjws/article/1396862 (Erisim: 15 Haziran 2026).