INDEX WORDSLilium longiforum, Lilium 'Enchantment', overcoming incompatibility, incongruity, pollen treatment, temperature treatment, cut-style pollination, mentor pollen, pioneer pollen. SUMMARY Four methods were investigated for their capacity to overcome incompatibility and incongruity in Lilium longiflorum and the Lilium hybrid 'Enchantment'. Temperature treatments of pollen at 40" to 60°C for one hour had no effect on germination capacity. None of the temperature treatments influenced incompatibility or incongruity. Application of cut-style pollination had a positive effect on self-pollination of 'Enchantment', but did not overcome self-incompatibility in L. longiflorum.With the aid of genetically inactivated (by irradiation) compatible 'mentor' or 'pioneer' pollen self-incompatibility of L. longiflorum could be largely overcome. Both methods also gave promising results in realizing interspecific crosses.