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Picture of Kerria with double flowers.

Picture of Kerria with double flowers.

David Beaulieu

Plant Taxonomy of Japanese Rose:

Plant taxonomy classifies Japanese rose as Kerria japonica. The cultivar I, myself grow is 'Pleniflora.'

Plant Type for Kerria Japonica:

Kerria japonica plants are deciduous flowering shrubs.

Characteristics of Japanese Rose Flowers:

Japanese rose shrubs bear yellow flowers in spring and can provide additional blooming later in the summer. Mine bloomed for 6 weeks last spring, were without flowers for the following 6 weeks, then offered a second blooming that lasted the rest of the growing season (although sparser than the spring flowering). I grow a double flowering type that produces a pompom-style blossom, but single flowering Kerrias are preferred by some.

More Characteristics -- Branching Pattern, Bark:

Japanese rose branches are also of interest. The main branches on the double flowering type arch gracefully to a height of 8-10 feet (the width can be restricted to similar dimensions through general pruning and, specifically, the removal of suckers). Smaller branches radiate off the main ones in all directions. The branching pattern thus affords interest both vertically and horizontally; it is also relatively airy. The bark is a pleasing kelly green to greenish-yellow, to boot -- a color retained throughout the winter. For a photo of the bark color, click More Images under the photo above to access the gallery.

Planting Zones for Japanese Rose:

Indigenous to China and Japan, you can grow Kerria japonica shrubs in planting zones 4-9.

Sun and Soil Requirements for Japanese Rose:

Grow Kerria japonica in partial shade. It is one of the most shade-tolerant of the deciduous flowering shrubs, earning it a spot on my list of the top shrubs that grow in shade. The plants, themselves will also do fine in sun, but sun causes the color of the flowers to fade quickly.

Japanese rose isn't overly fussy about soil pH; just give it a loamy soil. It will also tolerate poor soils but may perform better in soils enriched with humus. The ground should be kept evenly moist around Kerria japonica, which prefers a well-drained soil.

Outstanding Characteristics:

Its shade tolerance gives you the option of having a deciduous flowering shrub in a partially shaded area, while the profusion of blooms on Japanese rose makes it a spring standout. Do not underestimate the importance, however, of Japanese rose's attractive branches, which provide much-needed visual interest for the winter landscape. In this sense, Japanese rose branches remind one of those on red twig dogwood and yellow twig dogwood. Choose a background against which the branch color can be displayed to optimal effect; e.g., Japanese rose's kelly green stems would look terrific against a barn red shed.

Plant Care -- Pruning Japanese Rose:

Japanese rose blooms on old wood in spring; prune just after its spring flowering is over. A second flowering later in the growing season is not unusual, but it's too late to prune at that point. Prune out dead branches as you find them. Old Kerria japonica plants in need of rejuvenation pruning may be cut down to ground level. Japanese rose spreads by suckering; remove suckers as they occur if you wish to control its spread. This plant spreads vigorously (a drawback for those seeking low-maintenance landscaping), so stay ahead of it with regular sucker removal.

Uses for Japanese Kerria:

Their shade tolerance makes Japanese rose bushes effective in woodland gardens. Kerria japonica is not a good choice for a formal hedge, because excessive pruning ruins its beautiful natural shape; but there's no reason the plant couldn't be used in a looser, informal hedge. Japanese rose makes for a delightful specimen plant in spring. To enjoy the shrubs fully in winter, consider using them in entryway landscaping or as foundation shrubs, where you won't have to traipse through the snow to view them up-close.

Origin, Meaning of the Common, Scientific Names for Kerria Japonica:

Besides "Japanese Rose," other common names for Kerria japonica pick up on the fact that it is a member of the rose family. The common name, "Easter Rose" alludes to its early blooming period (during Easter, in some regions). The flowers' color accounts for the common name, "Yellow Rose of Texas" (with an assist from the song by the same name). Meanwhile, others commonly refer to it simply as "Kerria rose" or "Japanese Kerria."

So much for the common names; let's turn to the meaning behind the scientific name. The genus name, Kerria comes from William Kerr, who brought the plant from the Far East to the West. The specific epithet, japonica alludes to the fact that the plant is native to Japan (it's also native to China). Finally, the cultivar name, 'Pleniflora' translates as "full flowered," a reference to its double flowers.

William Kerr was one of the great 19th-century collectors responsible for importing some of the plants from China that many in the West now take for granted. According to the University of Arkansas Extension, Kerr's contribution, besides Kerria japonica, includes heavenly bamboo and Pieris.


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