When can I transplant peonies? Rule of thumb opposite season that the perennal blooms is when to transplant.

Image from the Spruce, this is the buds that you need to notice when you dig and divide.  at least 3 of these to transplant. 

      ​Good morning:  Sun is out with clear skies.  We had rain yesterday and last night, don’t know how much the rain gauge was emptied when I checked.  Hopefully enough so I don’t have to water.  But watering will happen with the temperature going up and almost 90 degrees with humidity on Saturday.  Back to summer.  It looks like for 10 days above normal temperatures but also means rain might be coming in. High today is 76F(24C).  Enjoy! Stay cool, stay safe.
 
Australia family and friends for their Thursday Sept 11 will have 60F(15C).  One of our friends wrote that the weather is warming up. Lots of their spring flowers are starting to bloom.  I will post those pictures soon.  Enjoy, stay warm, stay safe.
 
I had a question about moving peonies, so I found this article about that.  Rule of thumb when a perennial blooms in the spring, then the opposite season to move it.  Peonies bloom in the spring, so they move and divide in the fall. 
 
Learn Why Fall is the Best Time to Move and Divide Peonies
Written By:  Robin Sweetser
Is your peony overcrowded, shaded, or just refusing to bloom? Fall is the perfect time to divide and transplant herbaceous peonies to give them a fresh start. With the right location, proper depth, and a little care, your peonies can thrive and reward you with stunning blooms for years to come. In this guide, we’ll walk you step by step through the best methods for moving, dividing, and planting peonies so your garden flourishes next spring.
Signs Your Peony Needs Dividing or Moving
I have a pair of old-fashioned ‘Festiva Maxima’ peonies planted on either side of the entrance to a small fenced-in garden. One blooms happily every year, but the other one hasn’t produced any blossoms for quite a while!
Each spring, I scrape away some excess soil from its base, thinking that it may be buried too deeply, but still, no flower buds are formed. Over the years, a tree planted nearby has grown up enough to cast shade on it for a good part of the day. The only way to know what the problem might be is to dig it up.
When to Transplant Peonies
September and the fall are the best times to transplant peonies. By then, the peony plants have died back and stored enough food reserves in their roots for the following year. Additionally, moving a peony in early fall allows the new divisions to establish themselves before winter’s cold arrives.
Many folks ask if they can move the peony in the spring. Technically, you can transplant the peony in the spring just as new growth occurs, but it may not bloom well that season.
Quick Steps to Transplant Peonies
Choose a sunny, well-draining location
Dig up the peony carefully, keeping roots intact
Divide roots if desired, ensuring 3 to 5 buds per section
Plant with buds 1½ to 2 inches below soil
Water well and mulch after planting
Step-by-Step Guide: How to Transplant Peonies
We found a better place for our beloved peony where it will get direct sunshine in the morning and early afternoon, and dappled sun later in the day.
We cleared a 3x3-foot spot that had been taken over by creeping thyme, dug a 2-foot-wide and -deep hole, and amended the soil with compost.
Even though the soil looked really good, we took advantage of this opportunity to enrich it even more with some compost.
The roots could have been easily separated into three smaller plants, but I kept them as one, hoping it would recover and resume blossoming sooner. If you are separating your plant, just make sure that each section has three to five buds or eyes on it. Peony roots are brittle, so take care when digging them up and handling them.
Carefully shake off the excess soil or hose it off to make locating the buds easier. Our plant had about ten buds that we could see.
This measurement shows that our plant was buried at the proper depth before we dug it up. The dark part of the stem had been covered with soil. We replanted it at the same depth.
Place the rootball over a mound of soil in the center of the hole and make sure the base of the buds is only 1 ½ to 2 inches below the soil. That small a depth can be hard to determine ,so lay a stick across the hole and measure down from it to just under the buds to check. Once it is at the right depth, spread out the roots evenly and fill in the hole. Carefully tamp down the soil and water well to settle the roots in and eliminate any air pockets.
Next spring, remove any flower buds to encourage your plant to put its energy into root growth rather than making blossoms.
It can take up to 3 years for a newly planted peony to reach its full flowering potential, so I know it will take a while for mine to adjust to its new home, but I am already looking forward to its fragrant flowers!
Taken from https://www.almanac.com/when-and-how-transplant-peonies
Till next time this is Becky Litterer, Becky’s Greenhouse, Dougherty Iowa [email protected]  641-794-3337  cell 641-903-9365  Beckysgreenhouse.com  Facebook Becky Kerndt Litterer or Becky’s Greenhouse