Check Out The BenefitsBecome an APS Member. Most of the European and American ‘lutea’ hybrid tree peonies like … This is generally carried out under glass in spring on to seedling rootstock of P. moutan grown in pots. When it comes to peonies, nothing makes a lasting statement in your garden or living area like the Itoh Peony. There are two approaches which we have found will have good success. The primary method of clonal (copying) propagation for ‘woodies’ is through the procedure of grafting, that is the joining of woody peony stem to herbaceous peony root. By planting peony seeds, new varieties will arise. In 1948, Dr. Toichi Itoh, a Japanese horticulturalist, finally succeeded--and the Itoh peony was born. Crown division, the traditional method of propagating all, but the woody peony types, works well with the Itoh Group sorts. ITOH Peony Hillary (Paeonia hybrid) feature large semi-double blooms that open a luscious shade of pink and age to cream with a pink tinge. Like all peonies, Itoh Group kinds give the greatest rewards in a well-drained, fertile soil sites.  If the desired planting site does not meet that standard, most gardeners will find it is well worth the effort to make it so.  See elsewhere at this web site for discussion of planting site development.  These cultivars have among the best hybrid vigor of any peonies, consistent with the wide differences between the inherent genetics of the two parent types.  The foliage is less prone to leaf fungi than generally true of the Lactflora Group parents.  Do follow the same annual late summer/early autumn cleanup against fungi as recommended for all peonies. Like herbaceous peonies, Itoh peonies will come back in the spring from the ground. If producing something completely new is desired, then growing them from seed is the method of choice. Remove the soil from the roots so that you can see what you’re doing. The Itoh Group cultivars (cultivated varieties, cvs.) When grown in raised rows, reset them so that the stem buds are deeper, to four or five inches below top of the raised rows, but not lower than the adjacent soil surface.   Moisture support during the first year is better when planted more deeply and the buds are protected from excessively wet conditions.  So placed, when the stems grow in future seasons, they will form stem buds at multiple levels:  the original crown level, very near or at the soil surface and one, two or three internodes in between on fully perennial portion of underground stems.  This affords the gardener a maximum flexibility of propagation choices.  The buds on perennial stems can be used for grafting scions, or, if left on the replant pieces, the extended stem can be positioned horizontally where all buds will put up stems, contributing to more rapid expansion of the bush in the following seasons.  Alternatively, if taken up for dividing after three or four seasons, it may be found the growth  at each of the original stem buds will have grown into a quality division which can be taken with a minimal dividing damage. Bush and itoh peonies should be spaced approximately 2 to 3 feet apart. Named for Toichi Itoh, the first hybridizer to successfully cross a tree Peony with an herbaceous Peony in the 1940’s, these popular gems are in high demand, prized for their huge, beautiful blooms and lush green foliage. Yellow intersectional peonies were first developed by Mr. Toichi Itoh of Japan in the 1940s. ©2020 American Peony Society. make up the most recently hybridized peony type to reach the ornamentals market place in quantity.  These innovations are produced by crossing the Lutea Hybrid tree peonies (woody stemmed) with the long grown common herbaceous peonies, the Lactiflora cvs.  Historically, attempts to succeed with this cross were for long met by failure.  The first known success was for specialist peony grower, Toichi Itoh, in Japan, but afterwards widely repeated in the West.  Thus the choice of cultivar group name made official by the American Peony Society in its capacity as International Registration Authority for peonies. Unlike the commonly grown herbaceous peonies, overwintering stem buds on some kinds will form at the soil surface as well as a couple inches below.  Occasionally one will discover a plant has formed one or more buds up stem, more like the woody peonies.  Unfortunately, however, the stems which support those stray buds, as in the herbaceous types, having formed in the above ground light they will be weakly hardy and easily killed over winter. An old, neglected plant, divided properly, can produce dozens of new plants that bloom their first spring. Each section should have at least three buds and plenty of root. Itoh peonies are much more available--and affordable! While they have the mounded growth habit of herbaceous peonies and die back to the ground in winter, they also produce immense flowers like tree peonies… In late summer / early fall we collect seed pods from many different cultivars. ITOH Peonies have advantages over the other peonies in that: They have stronger stems and … Propagation. ITOH PEONY HILLARY Each. from the crown. Characteristically, the Itoh Hybrid seedlings which have been named and reached the market place are among the best adapted of any peonies for use in a viewed landscape.  They demand minimal care.  Both are attractive and easy to grow.  The flowers are unique, the form similar to those of the Lutea Hybrid parent but in a wider range of color expression.  The plants are as easy to grow as their common peony parent, while the foliage can be expected to remain attractive throughout the growing season. Tree peonies can be propagated by grafting, division, seed, and from cuttings, although root grafting is most common commercially. About 5 in. It blooms in the spring and their blooms make a good impression with the vivid colors and lush foliage. Intersectional Peonies are an exciting new hybrid between Tree Peonies and Herbaceous Peonies. of soil level. Remove as much of the garden soil as possible and with a knife cut off sections of the crown. As a group, plant habit holds up especially well against the weather.  The stems are only weakly hardy, but notably stiff, consistently giving season long support of bush shape.  Most of them when mature will equal or exceed thirty inches height when in flower.  Outer stems of the bush can be expected to spread more widely than is typical of either parent, but do not easily fall.  The whole of it gives a medium height bush that may spread wider than tall. While specific information on winter hardiness of most individual kinds has yet to be established, cold tolerance is generally similar to that of the Lactiflora parent cultivars.   Some of Itoh peonies are performing successfully at locations in the Canadian Prairie Provinces and  Alaska. Tree peonies can best be spaced at least 4 to 5 feet apart. Itoh peonies are also resistant to peony blight. But that’s all changed. Itoh peonies can be deadheaded on an as-needed basis throughout the spring and summer months. Unfortunately some garden favorites like the advanced herbaceous hybrids ‘Coral Charm’ and “Lois’ Choice’ are also infertile. Until recently, these incredible, colourful plants were scarce and difficult to reproduce, and gardeners could expect to pay $1,000 or more for one. The results, however, are far more satisfying. Itoh peonies are hybrids between P. lactiflora and Lutea hybrid woody peonies, which is evident in their growth habits.   Their hybrid vigor draws upon their parents strongest traits and provides no nonsense culture. Their stems die back in the fall and must be cut back just like the herbaceous peonies. Crown division, the traditional method of propagating all, but the woody peony types, works well with the Itoh Group sorts.  During a propagation cycle (3 to 4 years), the underground stem (crown) extends somewhat with tuberous growth and swells with food storage similar in habit to the Lactiflora parent type, facilitating the process of division.  Tuberous food storage roots will similarly extend outward and downward, but will have a hard core, like the tree peonies.  After a three or four year cycle, well grown plants will yield a comparable increase.  The tuberous roots are of smaller diameter and longer than the common peony parent and somewhat less so than the woody peony parent.  Adjust the length of tuberous root on individual divisions to retain an approximately equal amount of food storage for support of first year growth. You will want to make sure each piece has at least one crown bud. Itoh peonies are sensitive to high levels of nitrogen. The lightly scented flowers have a long bloom time. Their blooms are large just like the tree peonies' and the foliage is like that of the tree peony as well. The stocks are readily raised from seed sown in spring under glass and grown on in pots throughout. Tips for Protecting Peonies in the Winter. Though tree peonies do … Crown division, the traditional method of propagating all, but the woody peony types, works well with the Itoh Group sorts.  During a propagation cycle (3 to 4 years), the underground stem (crown) extends somewhat with tuberous growth and swells with food storage similar in habit to the Lactiflora parent type, facilitating the process of division.  Tuberous food storage roots will similarly extend outward and downward, but will have a hard core, like the tree peonies.  After a three or four year cycle, well grown plants will yield a comparable increase.  The tuberous roots are of smaller diameter and longer than the common peony parent and somewhat less so than the woody peony parent.  Adjust the length of tuberous root on individual divisions to retain an approximately equal amount of food storage for support of first year growth. Flowering plants this year in full sun to part shade and in rich well-drained... 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