I dug up a bunch of iris this fall and broke them up. They were blooming okay but had formed huge woody centers. I have a bed of daylilies with an iris in the middle that might benefit from splitting as the bloom count is dropping every year. Course I am terrible about fertilizing. Might be the problem.
It will be interesting to see how the two beds I totally dug up, rototilled (poor worms), mulched, then rototilled, and replanted. Added a number of new plants plus some from the back yard like columbine. Hoping for a different more varied look.
With our warmed up weather also hoping it washes some of the azomite down to the root areas before we freeze up again.
I seem to recall that strontium 90 is what is used to get ages on bones and such. Half-life and all that. Not a scientist, just read a lot most of which seems to fall out the other side.