Q.Why Did My Stem Get Yellow And Fall Off After The 2nd Blooming?
Will a new stem regrow?
Certified GKH Gardening Expert
I don't know what the plant is, so it's hard to say whether that is normal. If that was the end of its life cycle, turning yellow would be normal, but not necessarily falling off. Could be a fungal issue involved.
If it's a perennial, it should grow back next spring.