Kassy, I'll try to address your question. Usually, when a semp rosette blooms, the entire rosette dies. Occasionally the bloom spike/rosette will also produce offsets on the bloom stalk or base of it during this process. I think it has more to do with the makeup of the variety than treatment or conditions.
I found your post and picture very interesting. A few years back, I experimented with a number of methods for easy propagation of sempervivum. Among them was the effort to start new plants from leaves. I was never able to get this to work like you have shown in your pictures. However, I see that you have done this. I am amazed and will have to go back to trying some more experiments. I'm wondering if a plant was able to start because it was a leaf from a bloom stalk (the ones I had tried were all from a normal rosette) or because of the high humidity you mention or a combination or some other factor.
I think there is something interesting for us to learn from your experience with your plant. However, let me just say, for now, that you are fortunate that the rosette did not completely die when it bloomed. The remaining growth should go on to produce new plants for you, unless, of course, the growth on the stem turns out to be another blossom. Thanks for sharing this very interesting experience.
