It also looks like some of those could have bloomed.
I agree with Kate, with time the soil has compacted, too much shade and too much water. I think the combination has been causing them to rot.
The happy note is that you saved some to carry on. Once they are growing in healthier conditions they should multiply quickly for you.
I look forward to seeing more photos of them newly planted, and watching their progress.
By the way, the above photos are great.
