Standard seed banking protocols recommend that orthodox seeds should be dried to 3% to 7% moisture content and then stored at −18 °C (FAO/IPGRI, 1994). Our data indicate that while short-term storage of H. sieboldiana seeds under standard seed bank conditions may be feasible, cryogenic storage might be a more efficient method for long-term conservation for these comparatively short-lived seeds. Indeed Stanwood (1984) has shown that H. sieboldiana seeds survive in liquid nitrogen.