Hi Alex,
Last fall, I dug lots of bulbs from my garden as I am redoing a bed along the driveway. I want succession of blooms. I was thinking that the daffs will die back anyway leaving the peonies to grow until fall. Although I don't divide my daffs, you pointed out a future problem for my peonies. I should have dug another hole for the daffs and not plant them with the peonies. I was running out of time last fall. The bulbs and roots should be in the ground before the ground freezes! I have a spot in my garden that I planted all sorts of bulbs with a peony and the peony was doing fine but no daffs in it.
I think that sedum and sweet woodruff are good under plantings for the peonies. I think they'll look great. I interplanted my peonies with lilies and irises and it worked for me and mulched the bed.
This is the NOID tree peony that I posted last fall.
Believe it or not, there is a peony in there!
The Baptisia (purple shoots) needs to be moved.
Can you spot the peony?
I need to thin out the irises.
As you can see, I am not thinking of space allocation at all!