Where available, bare root peonies should be planted out or potted up as soon as possible, avoiding frosty or waterlogged conditions. Choose a sunny, well-drained position, as peonies flower best in full sun and dislike being moved once established.
Plant all peonies into well-prepared soil, ensuring the highest bud on the crown is no deeper than 5cm (2in) below the surface. For newly planted plants, protect emerging shoots from late frosts in their first spring. Keep plants well watered and fed during growth, using balanced, slow-release fertiliser rather than high-nitrogen feeds, and remove spent flowers once faded.
Mulch with well-rotted compost or manure, support tall stems to prevent flopping, maintain good air circulation, and remove any yellowing or diseased leaves. Leave remaining foliage intact after flowering, cutting back only in autumn once it has naturally died down. Avoid disturbing established crowns, as peonies dislike being moved may take a season or two to establish.