Jasen
Thanks for posting this beautiful specimen. I am surprised it tolerates so much light. Mine blooms in the house with Eastern Exposure.
This is the few Catt hybrids I recommend for windowsill for its health, compact size and ease of bloom. It has one of the most delightful rosy floral scents too. Mine recovered from deep rhizome rot in water culture and went on to produce 5 perfect blooms in a little more than a year. My most remarkable save so far. This is a link to show the abundant root system on the second tiny growth.