I think it would be helpful to mention their is a sort of relationship to dividing a rosette and blooming out. Many colonies start off with rosettes that are the same age. You might have received, for example, several offsets that were created that same growing season. Take this forward as the colony grows. Two or three seasons later, the original offsets have bloomed and died, but all of their offspring are still growing "in sequence" and can be the same age. Then, you get a growing season where all of the previous offsets bloom without creating offsets. This can lead to the collapse of a colony.
So, what to do about it?
Dividing a rosette the growing season before it will bloom sets the bloom time for the rosettes of the division back a season or two. This creates a line of rosettes with a different sequence from the original one and can help limit colony collapse due to blooming.
