I have noticed that the distance between blooms is getting progessively shorter on one of my phrags. (ie 4 inches between the flower nodes for blooms A&B, then only three inches between B&C etc--just guessing on the measurements, I haven't actually measured, but it is visibly decreasing) The flowers are so big they start to look a little cramped when several are open at once.

The leaves still look fine and it is still blooming. Is this a normal "aging of the spike" thing or is the plant trying to tell me it needs something? (more light, more nitrogen . . . ?)

The blooms are lasting about 2-3 weeks, and I assume that is normal too (is it)? With the oldest bloom falling off shortly after a newer bloom opens fully. Any way to make them stay longer -- or is that just part of sequential bloomers?