Planting & Care
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Plant Requirements
Peonies require half to a full day of sun, good friable, well-drained soil, air circulation around the plant, and a cold winter dormancy period. Bush peonies are suitable for USDA zones 2-8; tree peonies are suitable for USDA zones 4-8. They need a cold winter dormant period in order to bloom and thrive. Fall is the correct time for planting bare roots giving them a chance to become established before bloom time. We ship between September 15th and October 15th. All root shipments will include planting instructions.
Find detailed information about your planting zone with the USDA Plant Hardiness Zone Map.
Peonies Claim to Fame
The Peonies Claim to Fame is longevity, with plants documented to have lived for 50 to 70 years. A mature plant will usually take up a three foot space and produce a large number of blooms. Care requirements are minimal. Although the initial investment is greater than for an annual flower, the life span of this perennial plant makes it a smarter purchase. After flowering and until the first Fall freeze, the deep green foliage can make a lovely backdrop for other colorful flowers or plants.
Root Divisions
Mature Peony Root
Overview
Peony Care includes:
- Light fertilization with a tulip/daffodil bulb fertilizer at emergence in the spring and when they start to die down in the fall
- Removal and disposal of foliage after Fall freeze
- Maintaining only 2″ of soil cover over the upward facing growing eyes (shallower in warm zones)
- Maintaining moderate soil moisture during the summer
The main disease affecting peonies is botrytis, or grey mold, which is a fungus and should be treated with copper sulfate or other fungicides (Such as fungicides for black spots on roses). Allow for air circulation around the plant and destroy the foliage after Fall freezes to reduce the possibility of disease.
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Spring Care
It’s Time to Fertilize:
We recommend a tulip or daffodil bulb fertilizer, but there are also some perennial plant fertilizers that get the job done. The main thing to keep in mind is that the nitrogen content must be kept low, and one way to accomplish this is to use a slow-release nitrogen formula. Too much nitrogen causes lots of foliage growth but doesn’t encourage bloom. So be mindful, and don’t overdo it.
Clean-up:
If you didn’t cut the old foliage off at the ground last fall, you had better get it done now. Also while you’re cleaning up, please don’t pull the old stems, as the buds for new growth are formed on the sides of the old stems. And keep in mind, peonies are not like daffodil foliage, which you can just grab and pull after it has turned yellow – doing this to a peony will destroy your plant.
The Grass Enemy:
A reminder to keep grass from growing close to your plant. When working on the peonies that were in Bush Park we learned what grass can do to a peony root. All the food storage roots stayed very small and thready because they had to grow through the grass roots. It was very pathetic, but we did our best to save them, cleaned up the beds and replanted the best roots. DO NOT USE ROUND UP around peonies.
Pet Protection:
If you have rowdy pets you might like to know that the new stems are fragile. The stems coming out of the ground in the wet of spring have a lot of turgor pressure – like when you take a fresh carrot and bend it and it snaps in two. (Unlike a dry carrot that only bends.) So if you have rowdy pets, or children, you might want to stake some fencing around them for protection. I know a dog who decided that where I had plants coming up was a good place to lay down for a nap, so I had to put in some stakes to make the spot quite uninviting.
Watch Peonies Grow:
Another spring activity that is more exciting than any of those mentioned above is to watch your peony grow! It really is exciting! The coral colored ones are very early coming out of the soil and the foliage is very red. With sunshine to encourage growth the leaves begin to unfurl. Peonies with officinalis parentage (like Red Charm) have their flower buds formed before pushing out of the soil! Other peonies from colder climates wait until slightly warmer weather to form buds on the stems. You might also be interested that the officinalis peonies form only one bloom per stem, whereas the peonies with lactiflora parentage can have up to 7 (but normally 3-5) side buds. Which brings us to the subject of disbudding…
Disbudding (or removal of side buds):
is done for a couple of reasons:
A) to send more strength to the roots of 1st year plants,
B) to make the remaining flower larger,
C) to reduce the weight on the stem to help keep the flower upright in the rain.
How to Dispud:
Push the side bud stem sideways between the main stem and the small leaf beside it so that it pops off at the base. This allows the small leaf to remain, covering the small scar. It is best to take the side buds off when the side buds are the size of a pea. When they are smaller they tend to be too close to leaves to remove easily and when larger they leave ugly scars.
Summer Care
- Dead-head after bloom, cut the spent flower to the first leave joint from the top of the flower (by doing this, this will save food for next years bloom because it is not maturing the seed in the center of the flower)
- Maintain moderate soil moisture, they need watered during the summer months as you would water other plants.
Fall Care
- In the late Fall, between Halloween and Thanksgiving, you should cut peony stems off to ground, tree peonies do not get cut back to the ground (the woody stems stay intact), only herbaceous and intersectional peonies get cut to the ground. For preventative measures the stems and foliage should be placed in the garbage to prevent the spread of any botrytis spores (grey mold) that might be present. Composting materials with botrytis can help to multiply and spread these fungal spores. Botrytis is a natural fungus that is present in the soil. Its job is to break down dead plant material. In prolonged cool, rainy weather it can get mixed up and attack live plant material.
- Fertilize with a tulip/daffodil bulb fertilizer, it is best to fertilize first then cut down the stems, so that you can see when the stems are and put the fertilize around the stems.