Tree Peonies
Deer resistant. A pollinator favourite. Tree peonies grow well in zones 4-9. They need to be deeply planted, in an area with excellent drainage.
They are slow growing, taking about 10 years to mature.
Be wary of planting in areas where snow can fall from roof lines and where snow gets piled by shovels or plows. If your tree peony is planted in such areas, precautions should be taken to prevent the branches from breaking. They also like some protection from wind while in bloom.
They like at least 6 hours of sun per day but prefer a bit of dappled or shade in the hot afternoon. This will prolong the life of the flowers.
PEONIES ARE COLD-HARDY PERENNIALS. They should be planted the first chance you can get a shovel in the ground, regardless of frost or freeze potential.
Spring planting occurs from the time the ground starts to thaw, through mid June. Fall planting occurs from late August until the ground freezes solid. Do not mulch your peonies; they need the cold to flower in the spring, and mulch will insulate peonies from the cold.
Plant tree peonies 5 feet apart at center. Dig a hole 2 feet deep and add lots of rich compost. This will seem like a huge hole for a small root, but remember that this will grow! Your tree peony prefers to be planted and left in one location for generations, so it is worth taking the time to do it right. Remember to amend your soil with some rich compost.
Grafted tree peonies should be planted so that the GRAFT IS FOUR TO SIX INCHES BELOW THE SURFACE OF THE SOIL. This deep planting allows the tree peony to grow its own root system and prevents the grafted herbaceous root from growing herbaceous shoots.
Once planted, press down on the soil to remove air pockets around the root adding more compost as you go and water your tree peony in well. During the first two growing seasons after planting a new tree peony, ensure that it gets a good soaking every two weeks. This will allow the plant to get enough water while the root system becomes established. Remember that peonies do not like wet feet, so good drainage is important. The soil needs to dry out fully between waterings. Watering daily or the use of foliar sprinkler systems can cause rot. It is essential that your peony be planted in well-draining soil so that the water does not pool around the plant. Established peonies are incredibly low maintenance and require little to no supplemental watering, except in times of extreme drought. It is possible that a tree peony will not produce growth above ground or leaf out the first spring. This can be very scary but typically the tee peony will start to take off the following spring. Even it they do leaf out the first year, do not expect much out of your tree peony. Peonies are very resilient and hardy, but do take time to establish and become a mature flowering plant. Please check YouTube for more in depth videos on planting and care of tree peonies.