I purchased 'Handwriting on the Wall' as a potted plant in 2019. It has come through two difficult winters very well. It also did well during the very hot, dry summer of 2021. It is in a nice, sunny location, although with our sandy soil, it is dry, especially during a summer such as our last one.
Even under difficult conditions it did produce lovely blooms. I haven't done a bud count, but I have been pleased with its performance. I would certainly recommend this cultivar.