Red seed will not have been fertilised and will not germinate so can be discarded
Collect the ripe seed once the seed pods begin to split in late summer and autumn. It can still be interesting to try growing from seed, however, and occasionally you will see a self-sown seedling that you might like to grow on. You might get some interesting new hybrids but, in truth, they are often not as good as their named variety (cultivar) parent. Species such as Paeonia delavayi can be grown from seed as can hybrids, but the latter will not breed true. The small-flowered Paeonia delavayi (both red and yellow forms), however, are quite vigorous and stems may need thinning (see Pruning tree peonies). Tree peonies are very long lived and most slowly develop into larger clumps. The foliage dies back in late autumn and the plants remain dormant until spring. Any seed set would, in any case, not breed true and the resulting seedlings would have different flower colours. Deadheadingĭead flowers can be removed after flowering using secateurs as most tree peonies are hybrids and often do not set viable seed. Then mulch with a 10cm (4in) layer of garden compost or well-rotted manure to conserve moisture and suppress weeds, but avoid piling up mulch against stems as they may rot. To promote good growth and flowering, apply a general-purpose fertiliser, such as Growmore, in each spring at 70gm per sq m (2oz per sq yd). Established tree peonies are deep-rooted and after the first year should not need routine watering. Water regularly in dry spells during the first year to aid establishment, especially if planted in spring or later in the season. Just avoid piling up mulch against stems as they may rot. Mulch with organic matter, such as garden compost or well-rotted manure, to conserve moisture. Water in to settle the soil and continue watering regularly, especially in dry weather, during the first summer. Deep planting encourages the grafted plant to form its own roots When planting, the graft union should be about 15cm (6in) below the soil level. Look for the graft union (visible as a slight bulge) close to the base of stem. Most offered for sale are grafted on herbaceous peony rootstock. Tree peonies need a little extra care when planting. We have put together a guide to help you identify your soil type. It’s possible to improve most soils enough by digging in organic matter, such as garden compost or well-rotted manure, but those which are very acidic or alkaline can remain unsuitable Tree peonies prefer neutral, humus–rich, well-drained soils, but they will tolerate slightly acid or slightly alkaline soils. Choose a sheltered position to prevent damage to flowers and foliage by strong winds. Tree peonies are very hardy, but the foliage and flower buds can be damaged by late frosts so avoid frost pockets. Plant in a sunny or lightly-shaded position. Avoid planting in late spring and in summer as plants will not establish well in hot, dry conditions. Tree peonies are best planted in autumn, but winter or early spring planting is also suitable. To track down specific ones you can use the RHS Find a Plant tool. A small selection are also sold in pots ready for planting from late spring to early summer from garden centres. The widest range is available from specialist nurseries often sold as bare-rooted divisions in late autumn. Semi-double – these are like single peonies but with 2 or 3 rows of petalsĭouble – large, rounded flowers with narrower, overlapping, ruffled petals that fill the centres so the stamens can barely be seen Buying tree peonies Single – mostly cup-shaped with 1 or 2 rows of large incurving petals and a large central boss of fluffy gold stamens The bowl-shaped flowers can be very simple with a single arrangement of petals through to fully-double, blousy blooms. Colours range from white through pink to dark red and purple yellows are available too, along with the more unusual apricot shades. 
Gardeners usually choose a tree peony based on flower colour and shape. Tree peonies have attractive foliage and large bowl-shaped flowers. Malvern Autumn Show - 23–25 September 2022.RHS Garden Wisley Flower Show - 6–11 September 2022.RHS Garden Rosemoor Flower Show - 19–21 August 2022.
RHS Garden Hyde Hall Flower Show - 3–7 August 2022.RHS Flower Show Tatton Park - 20–24 July 2022.RHS Hampton Court Palace Garden Festival - 4–9 July 2022.RHS Garden Harlow Carr Flower Show - 23–26 June 2022.RHS Botanical Art and Photography Show - 9–29 April 2022.RHS Garden Wisley Spring and Orchid Show - 25–27 March 2022.
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