germination percentage and speed. For example, seeds coldstratified
for 8 weeks germinated to 82% after 6 weeks incubation
at 25/15 C, while those cold-stratified for 12 weeks germinated to
87% after 1 week at 25/15 C. After 16 weeks of cold stratification,
76% of the seeds had germinated at 5 C (Fig. 1b). t50 of seeds
incubated continuously at the six temperatures ranged from 94.3
days at 30/15 C to >252 days at 30/20 and 25 C, and the t50 of
seeds receiving 4, 8 and 12 weeks cold stratification and tested at
25/15 C was reduced from 153.4 days for fresh seeds to 4.0 days for
seeds cold-stratified for 12 weeks