The fact remains, their potentiality for further improvement and diversity seems inexhaustable, and in the last few years, a few new varieties have come along that eclipse even some of the classics in form and colour. Often overlooked, one of the finest features of peonies is the fabulous fall colour they provide. If grown in sun, peonies leaves turn from green to burgundy in a matter of a week. Rich, friable garden soil is best. Some form of organic matter, such as well-rotted manure or leafmold can be added to make it more friable.
Sandy soil is OK as long as fertility is maintained.
Manure is good for this too but many gardeners get more specific and say that 'horse apples' are best. Peonies prefer a pH of 6.0 to 7.5. Peonies flower best when exposed to full sunlight, although partial shade can produce satisfactory results. Like a rose, at least 5 hours of strong sunlight per day is a good rule of thumb. Because of the need to stake them, it's also best to keep them out of high winds.