yes it is correct but we must know exactly how many hour of cool and also  how many degree are needed for every species and variety,

stratification usually made at 5oC for at least 3 weeks depend upon seed testa hardness and permeability to water..... GA3 25 to 50 PPM is higly recommended. 

However, we need the causative 

Yes, I think stratification is advisable. Other explanations for the lack of germination are dehydration of seeds and/or a possible naturally low percentage of germination in this species.

Andrew :-)