Caltha palustris

Germination Tips

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This species needs special care as described.

5

Germination is successful only when GA3 is used. See http://botanicallyinclined.org/fridays-seeds-with-the-ga3-seeds-treatment

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

Special Care: 
hydrophilic, sow as soon as seed is ripe; will not germinate if seed has dried; for storage put in plastic bag with barely damp vermiculite; keep them warm during summer, coolish towards the fall and then 4⁰C at the onset of winter. Do not store them in the freezer because the formation of ice crystals will damage cell membranes; bog plant; stand pot in 3 cm water; raise temperature very slowly after germination
Most of the seeds in our Germination Guide have been offered from time to time in our annual Seed Exchange (Seedex).