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Peonies are incredible plants, but they require deep root development before they can bloom. This means that fully-bloomed peonies will die if you plant them without giving the roots time to develop. Purchase peony roots in the fall so that you can plant them in 2-8 weeks before the first frost of the season. This will give the plants plenty of time to settle into the soil.  Peonies actually need a cold winter to grow and bloom. If you plant them in the spring or summer before exposing them to a cold winter, they may never grow. Peonies don’t do well when they’re transplanted to new locations. Take particular care when selecting a location for your flowers so that you get it right the first time. If you live in a slightly warmer part of the world, get tree peonies. They only require 100-300 hours of cold weather a year to adequately grow. You can’t grow peonies where you live if you don’t regularly experience near-freezing temperatures in the winter. Peonies require a lot of direct sunlight to reach maturity. Select a part of your garden that isn’t covered or under shade to ensure that your plants have plenty of access to the sun. Peonies will tolerate a little shade, but putting them under a tree or awning is a surefire way to keep your flowers from blooming. Peonies typically need 6-8 hours of sun a day.  You can grow peonies in a pot indoors, but peonies require a lot of sun and a lot room to grow. It is extremely difficult to keep peonies alive in an indoor pot and is not recommended. If you do want to plant peonies indoors, use a pot that is at least 1 ft (30 cm) deep and 1 ft (30 cm) wide for each plant. If you’re keeping your flowers indoors, put them next to an east-facing window so that they have adequate exposure to sunlight throughout the day. Peony roots will grow deep and wide. These flowers do not like to compete with the roots of other plants. Select a location in your yard where there are no other nearby plants or obstructions. Ideally, there should be no other plant or tree within 3–4 ft (0.91–1.22 m) of each of your peonies.  If you’re planting peonies that have already begun to bloom or flower, plant them in the early spring to ensure that they fully bloom before winter comes. Don’t stick the peonies in a totally isolated area, though. It’s good to have some shrubs, trees, or buildings nearby to break up the wind and protect your flowers from strong gusts. Peonies do best in well-draining soil. Avoid planting peonies in parts of your yard where water tends to pool or settle. If you’re using your native soil, look for sandy, looser sections of soil. If you don’t have the right type of soil in your yard, buy a well-draining planting soil from your local gardening store and use it to supplement the soil in your yard.  Peonies can do fine in clay soil so long as it isn’t too compacted. A mixture of bark, peat moss, and perlite will create a simple well-draining mix.
Purchase peony roots in the early fall before the first frost. Select a part of your yard or garden that gets at least 6 hours of sunlight a day. Avoid planting your peonies near any other trees, flowers, or shrubs. Look for a section of your yard with well-draining soil.