Germinating Bigleaf Maple (Acer macrophyllum) Seeds

Bigleaf maple seeds (paired samaras) require cold stratification to overcome dormancy.

Standard Protocol

Collect fresh seeds in autumn.
Sow in pots at a depth equal to seed length.
Place outdoors for winter (natural stratification) or refrigerate in moist peat for 90 days.
After cold period, move to 70–75°F; germination in spring.
Repeat cold/warm cycles if needed.

Seedlings prefer partial shade and consistent moisture.

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