Great topic! All of my lilies were first year performers, so keep that in mind.
There were the best performers overall:
Lilium regale--managed to bloom for a solid three weeks through the June heat wave.
Scheherazade/Silver Scheherazade--outstanding heat tolerance.
Lilium henryi--outstanding heat tolerance.
Conca d'Or--one of the best among fragrant OTs.
In general, any lilies with thin petal texture such as Asiatics tended to not hold up very long. Ditto for the beautiful LOs 'Triumphator' and 'El Condor' which stayed in glorious full bloom for barely 1.5 weeks each before the show was over due to heat.
