Carya illinoinensis


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Hardiness Zone

5a (Successfully verified in this zone)

Region of Origin

Midwestern and South Central United States

Mother Tree located in

Niagara-on-the-Lake, Ontario

Seeds Type

Orthodox, that is to say seeds with the capability to withstand desiccation and freezing temperatures (-20°C) and may therefore be conserved for years, if not decades. In the case of juglandaceae (walnut family which includes the genus hickory), the seeds cannot be kept as long as for other orthodox species. For this reason, we recommend not to store these seeds for more than two or three years.

For germination, you must...

1. allow THREE MONTHS for seed treatment;
2. subject them to a scarification AND a cold stratification before sowing (follow the steps below in order).

Scarification : Soak the pyrenes (nuts) in water at room temperature for 24 hours.
Stratification (cold) :  Line the pyrenes (nuts) on the side - the same as if they fell on the ground - in a bag (Ziploc Slider type) containing slightly premoistened peat moss. Seeds should be surrounded by the latter. Close the bag and place it in cool storage (between 1°C and 5°C) for approximately three months.
Seedlings : Take out the pyrenes (nuts) one by one from the bag and take care not breaking the germ (if there is one) and not turning them over on themselves. Bury lightly, less than a centimeter from the surface of the soil.