Plant cell suspension culture has been considered as an alternative to agricultural processes for producing valuable secondary metabolites. The biggest challenge of producing secondary metabolites from plant cell suspension cultures is that secondary metabolites are usually produced by specialised cells and/or at distinct developmental stages. Some compounds are not able to be synthesised if the cells remain undifferentiated. Therefore, undifferentiated plant cell suspension cultures often lose, partially or totally, their biosynthetic ability to accumulate secondary products.