Cyclamen Temperature Guide | Ideal Conditions from Seed to Bloom
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Cyclamen shine when temperatures stay cool and steady. Use this guide to dial in temps from sowing to flowering so plants stay compact, healthy, and long-blooming.
🌱 Germination (Weeks 0–4)
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Soil temp: 65–68°F (18–20°C)
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Light: Dark until sprout, then bright/indirect
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Moisture: Even—never soggy
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Tip: Heat spikes above 70°F (21°C) slow or stop sprouting.
🌿 Seedling Grow-On (Weeks 4–10)
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Day: 65°F (18°C)
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Night: 59°F (15°C)
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Airflow: Gentle, continuous to prevent damping-off
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Feeding: Light, 75–100 ppm N every 2–3 waterings
🌸 Bud & Bloom (Weeks 10+)
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Day: 60–62°F (16–17°C)
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Night: 55–57°F (13–14°C)
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Why it matters: Cooler finish = tighter plants, richer color, longer bloom.
☀️ Heat & Dormancy (Late Spring–Summer)
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As temps rise, leaves may yellow—this is normal dormancy.
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Care: Reduce watering, keep 50–60°F (10–15°C) if possible, restart light watering when new growth appears in late summer.
Quick Reference
| Stage | Ideal Temp | Notes |
|---|---|---|
| Germination | 65–68°F (18–20°C) | Darkness required |
| Seedlings | 65/59°F day/night | Bright, indirect light |
| Flowering | 60–62°F day, 55–57°F night | Extends bloom life |
| Dormancy | 50–60°F storage | Keep mostly dry |
🌺 Shop Cyclamen Seeds
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Bulk Cyclamen seed pack – https://www.trailingpetuniabulkseeds.com/search?q=cyclamen&options%5Bprefix%5D=last
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Regular Cyclamen seed packs – https://www.trailingpetunia.com/search?q=cyclamen&options%5Bprefix%5D=last
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Cyclamen Super Serie Dragon – https://www.trailingpetunia.com/search?q=cyclamen+dragon&options%5Bprefix%5D=last
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Bulk Site – All Packs – https://www.trailingpetuniabulkseeds.com/
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Smaller Packs – All Seeds – https://www.trailingpetunia.com
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How to Grow Cyclamen from Seed | Step-by-Step Germination Guide – https://www.trailingpetunia.com/blogs/news/how-to-grow-cyclamen-from-seed-step-by-step-germination-guide
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Cyclamen Seed Germination Secrets | Temperature, Light & Moisture Tips – https://www.trailingpetunia.com/blogs/news/cyclamen-seed-germination-secrets-temperature-light-moisture-tips
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When to Plant Cyclamen Seeds for Best Germination Rates – https://www.trailingpetunia.com/blogs/news/when-to-plant-cyclamen-seeds-for-best-germination-rates
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Cyclamen Care After Germination | Watering, Light & Feeding Tips – https://www.trailingpetunia.com/blogs/news/cyclamen-care-after-germination-watering-light-feeding-tips
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Cyclamen Seedlings Care | How to Transplant & Harden Off Safely – https://www.trailingpetunia.com/blogs/news/cyclamen-seedlings-care-how-to-transplant-harden-off-safely
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Cyclamen Dormancy Explained | What to Do When Leaves Die Back – https://www.trailingpetunia.com/blogs/news/cyclamen-dormancy-explained-what-to-do-when-leaves-die-back
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💬 FAQ | Temperature Troubleshooting
Leaves soft/yellow in bloom area? Usually too warm—move cooler (below 65°F).
Leggy seedlings? Heat + low light. Drop temp at night and increase indirect light.
Botrytis on petals? Cool + stagnant air. Add airflow; water mornings only.