🌻 Sunflower Helianthus annuus
🌸 Flower & Beneficial 🧬 Daisy family (Asteraceae)
Companion plants for Sunflower (Flower & Beneficial): 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
📅 SowingSow directly into the soil or into modules after the last frost; transplant when seedlings reach 10-15 cm.
🌱 Depth2-3 cm
📏 Spacing30-60 cm (depending on variety)
🌞 SunFull sun
💧 WateringModerate; keep the root zone slightly moist, avoid wetting the leaves
🧺 HarvestCut once the heads are fully open and the seeds have matured (usually 60-90 days)
🪴 SoilModerately fertile, well-draining; very rich soil increases stem length but reduces flowering
⭐ DifficultyEasy
🗓️ SeasonSpring / Summer
📅 Calendar is for the Northern Hemisphere; in the Southern Hemisphere shift sowing times by ~6 months.
💡 Key tip: Choose pollen-bearing varieties to best support a diversity of beneficial insects: pollen-free ornamental types may still draw bees with nectar but don't provide the protein/pollen source bees need. Regular deadheading only encourages reblooming in branching varieties; on single-stem types it has no effect. Leave the heads on if you want birds and seed.
🤝 Companion logic: Compatible with squash and corn (the 'fourth sister' of the Three Sisters); it draws pollinators and beneficial predatory insects, and gives cucumber and tomato a living stake and temporary shade. Keep it away from potatoes, pole/climbing beans and rhubarb: sunflower root secretions (allelopathy) hinder germination and growth, and for rhubarb it acts as an alternate host of a pest insect (rhubarb curculio). Leave 60-90 cm between it and sensitive plants.
🔬 Scientific References
- Missouri Botanical Garden (t.y.) Helianthus annuus. Erişim adresi: https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=a583 (Erişim: 12 Haziran 2026).
- North Carolina State Extension (t.y.) Helianthus annuus (Common Sunflower, Sunflower, Wild Sunflower) | NC State Extension Gardener Plant Toolbox. Erişim adresi: https://plants.ces.ncsu.edu/plants/helianthus-annuus/ (Erişim: 12 Haziran 2026).
- Royal Horticultural Society (t.y.) Helianthus annuus (common sunflower). Erişim adresi: https://www.rhs.org.uk/plants/105515/helianthus-annuus/details (Erişim: 12 Haziran 2026).
- The Old Farmer's Almanac (t.y.) Sunflowers: Planting, Growing, and Caring for Sunflowers. Erişim adresi: https://www.almanac.com/plant/sunflowers (Erişim: 12 Haziran 2026).
- West Coast Seeds (2021) Companion Planting. Erişim adresi: https://www.westcoastseeds.com/blogs/wcs-academy/companion-planting (Erişim: 12 Haziran 2026).
- Grant, B.L. (t.y.) Companion Planting With Sunflowers, Gardening Know How. Erişim adresi: https://www.gardeningknowhow.com/ornamental/flowers/sunflower/sunflower-companions.htm (Erişim: 12 Haziran 2026).
- Janusauskaite, D. (2023) 'The Allelopathic Activity of Aqueous Extracts of Helianthus annuus L., Grown in Boreal Conditions, on Germination, Development, and Physiological Indices of Pisum sativum L.', Plants, 12(9), 1920. doi:10.3390/plants12091920.
- Jabran, K. (2017) 'Sunflower Allelopathy for Weed Control', içinde Manipulation of Allelopathic Crops for Weed Control. Cham: Springer. doi:10.1007/978-3-319-53186-1_9.
- Kireç, Y. (2020) Doğadaki dayanışma: Kardeş bitkiler. Buğday Ekolojik Yaşamı Destekleme Derneği. Erişim adresi: https://www.bugday.org/blog/dogadaki-dayanisma-kardes-bitkiler/ (Erişim: 12 Haziran 2026).
- Tan, A.Ş., Altunok Memiş, A. ve Aldemir, M. (2017) 'Bazı Çerezlik Ayçiçeği Çeşit Adaylarının Menemen, İzmir Ekolojik Koşullarında Verim Potansiyelleri', ANADOLU Ege Tarımsal Araştırma Enstitüsü Dergisi, 27(1), s. 1–16.