For optimal germination rates, initiate seed propagation indoors under controlled conditions—unless the species exhibits a high sensitivity to root disturbance. This approach allows precise regulation of temperature, humidity, and light, improving germination consistency and seedling viability. Do not skip any recommended seed treatments, as they are essential for uniform and successful germination.
Seed Treatment
Mix a copper-based fungicide (such as Cuprozin 35-WP) with distilled water.
Use this solution to moisten a sterilized seed-starting mix (peat + vermiculite or perlite) — this will be the medium you sow into.
Light Requirements
Begonia seeds need light to germinate — do not cover them with soil.
How to Sow
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Use the pre-moistened, fungicide-treated mix (peat + vermiculite or perlite). Avoid heavy or compacted soils.
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Make sure the mix is damp, not wet. Stick to distilled, rainwater, or filtered water
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Spread the tiny seeds evenly over the surface using folded paper.
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Do not cover the seeds—they need light to germinate.
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Mist lightly or use bottom watering to avoid disturbing them.
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Keep soil consistently moist but never soggy.
Lighting Requirements
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Provide 12–16 hours of light per day using grow lights.
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For LEDs: Start 20–30 cm (8–12 inches) above the tray.
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For fluorescents (T5 or CFL): Keep 10–15 cm (4–6 inches) above.
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Watch for leggy growth — if seedlings stretch, lower the lights slightly.
Humidity
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Cover with a humidity dome or clear lid to maintain moisture.
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Open briefly once a day for fresh air to prevent mold.
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Remove the dome once seedlings emerge.
Temperature
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Use a heat mat to maintain 75–78°F (24–26°C) day and night.
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Avoid temperature drops or cold drafts.
Germination Time: 1 to 3 months, sometimes longer. Be patient!
If nothing sprouts after 12+ weeks, allow the tray to cool for a few weeks, then place it back on the heat mat. This warm–cool–warm cycle can sometimes trigger delayed germination in dormant seeds.
After Germination
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Slowly remove the humidity dome to harden off seedlings.
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Keep in bright, indirect light.
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Transplant once seedlings have 2–3 true leaves.