Table 3. Summary of optimal seed storage conditions for each species of P. davidiana and P. koreana.

Storage temperature (°C)	Species
	P. davidiana		P. koreana
	Optimal SWC range (%)	Storage period (months); NGP	Optimal SWC range (%)	Storage period (months); NGP
Before storage (NGP)	97%		87%
Room Temperature	< 6	1; 80–83%	6–12	0.25; 36–37%
4	3	5; 93–100%	12	12; 27%
-18	12	48; >89%	9–12	24; 26–28%
-80	3–24	48; >91%	9–12	24; 28–29%
-196	6–18	NA; 93–100%	6–12	NA; 67–78%

Normal germination percentage (NGP); Seed water content (SWC); Not available (NA)