K-State horticulture expert Cynthia Domenghini says that, traditionally, peonies possess at least five broad petals in one or two rows.
How to increase bloom production of peonies
K-State horticulture expert suggests dividing peonies this fall
At a glance: Early fall is the best time to divide peonies, said K-State horticulture expert Cynthia Domenghini. Doing so can help increase bloom production for many years to come.
More information: Cynthia Domenghini, Cdom@ksu.edu
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August 16, 2024
K-State Research and Extension news service
MANHATTAN, Kan. – While dividing peonies is not necessary for long-term growth, Kansas State University horticulture expert Cynthia Domenghini said doing so can increase bloom production, reduce disease and provide more peony plants for the garden.
“If you choose to divide your peonies, it needs to be done this time of year,” Domenghini said.
To start dividing peonies, Domenghini said gardeners should cut the stems just above the soil surface. Next, dig up the entire root system and remove soil from the roots.
“Divide the root clump into small sections using a sharp knife,” Domenghini said. “Ensure each section has 3-5 buds as well as healthy roots.”
The planting location should receive sunlight at least half the day. Dig a hole large enough to fit the roots of the divided peonies so the buds will be covered by 1-2 inches of soil.
“Plants buried too deep may not flower,” Domenghini said. After planting, water thoroughly.
Space dwarf peonies at least two feet apart and standard peonies four feet apart. To protect the newly divided peonies in cold weather, add a layer of straw, leaves or compost after the soil freezes.
Domenghini warns that it may take a couple years for divided plants to return to full bloom productivity.
Domenghini and her colleagues in K-State's Department of Horticulture and Natural Resources produce a weekly Horticulture Newsletter with tips for maintaining home landscapes and gardens. The newsletter is available to view online or can be delivered by email each week.
Interested persons can also send their garden and yard-related questions to Domenghini at cdom@ksu.edu, or contact your local K-State Research and Extension office.
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K‑State Research and Extension is a short name for the Kansas State University Agricultural Experiment Station and Cooperative Extension Service, a program designed to generate and distribute useful knowledge for the well‑being of Kansans. Supported by county, state, federal and private funds, the program has county extension offices, experiment fields, area extension offices and regional research centers statewide. Its headquarters is on the K‑State campus in Manhattan. For more information, visit www.ksre.ksu.edu. K-State Research and Extension is an equal opportunity provider and employer.