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Will Super Deep Freeze Damage Tree Seed?

Oklahoma's Clark-McNary nurseries store their more valuable tree seeds with a commercial cold storage firm. Good seed has been stored for more than 10 years without appreciable loss in germination. Species, such as the pines, are stored in 5-gallon water bottles on shelves in a cold storage room where the temperature remains a nearly constant -10° F. What low temperature extremes can tree seed withstand without damage? Cattle breeders store semen for long periods in small vials immersed in liquid nitrogen. Could tree seed be stored like semen? The temperature of liquid nitrogen is -320° F.

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Author(s): Albert Engstrom

Publication: Tree Planters' Notes - Issue 77 (1966)