Nice photos! Mass flowering is always nice, since most of the species only open one at a time per day, if that. I've had D. montana var. montana provide me with 3 open flowers, as well as D. natalensis, and I always take a million or so scans when it happens!
Joachim, how tall are your plants? This is my first season with this species and I am very curious about all aspects of its culture, and most importantly what the best plan is for summer dormancy. Should I remove the tuber after the plant goes dormant? Since I have been told the rosettes must dry off slowly, I was wondering if this process will happen naturally with the warmer weather, or should I encourage the plant by gradually reducing the watering over the course of a few weeks? I grow D. peltata and auriculata without difficulty, but I understand these are wetter growing species, and I keep them moist all year. Is D. menziesii ssp menziesii more sensitive to wetness?
Another question is, how long would you say your plants are in active growth? My plant started very late in the season, so I hope to get an idea of the approximate growing season length, and try to keep it in active growth that long using a short day photoperiod if needed.
I love growing new plants! Thanks in advance for any information.