Trillium sp.

Germination Tips

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Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

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This species needs special care as described.

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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: 
Seeds must be stored cold and moist. Germination unlikely after storage for more than 6 months. If seeds are received dry, try hydrating in damp paper towel @ 20°C for 1 week. Trilliums first need 20°C during which a radicle is formed, then cold (4°C) for at least 86 days to trigger the emergence of the cotyledon which will appear when temperature increases in spring. No more leaves are formed that year. If sown early enough, the cotyledon will emerge in the first spring; otherwise usually not until second spring. Keep seeds in pots for 2 years Göte Svanholm (Mid-Sweden) provides this advice: Trillium seeds do not survive dry storage. Trillium will need a first warm (20°) period during which a radicle is formed. Then a cold period (0-4°) to trigger emergence of cotyledon which will appear when temperature increases in spring. No further leaves are formed that year. If sown outdoors early enough, cotyledon will emerge next spring but usually it will not happen until second spring. This applies to those naturally growing in areas with real winters and not to (Pseudo)trilium rivale. The easiest way is to push the berry into the ground beside the parent plant.
Most of the seeds in our Germination Guide have been offered from time to time in our annual Seed Exchange (Seedex).