Some diseases can cause the loss of the sense of smell..

Would a disease be invisible on the plant? The Casa Blanca grew nice and tall, multiple blooms per stalk, no discoloration or warping, no oddness on the leaves, no bugs seen - the only change from last summer is they were in pots last summer, and were planted in the ground after bloom. I kept as much of the original dirt around them as possible, didn't disturb the roots much, just plopped them in the ground. But no scent this year, and plenty of scent last year.