Kerria japonica 'Golden Guinea' (Japanese Rose)


Michael's Opinion

Golden Guinea is a weaker cultivar of Kerria japonica that might be a little problematic to grow in Ontario gardens. Nonetheless, it is an interesting plant if grown in a grouping, where its bicoloured flowers will produce a substantial show.

Botanical Information

FamilyRosaceae
GenusKerria
Speciesjaponica
Cultivar'Golden Guinea'
CategoryWoody
TypeShrub (deciduous)
Pronunciation

Details

USDA Hardiness Zone5 – 8
USDA Hardiness Ref.
Canadian Hardiness Zone6
Canada Hardiness Ref.
RHS Hardiness ZoneH7 - H4
RHS Hardiness Ref.
Temperature (°C)-32
Temperature (°F)-25
Height1 – 2 m
Spread1 – 3 m
GrowthMedium
Flowering PeriodJune, July, August

Description and Growing Information

General DescriptionLoosely mounded plant with numerous slender, zigzagging branches that emerge at ground level. Yellow cream flowers and colourful green stems make an attractive plant.
ID CharacteristicSmooth, uniformly green stems, buds are dark and contrast with the stem, the stems have a zigzag pattern of growth to them. Flower is semi–double and turns from yellow to cream.
ShapeLoosely arching form.
PropagationThrough cuttings in late spring to early summer.
CultivationTolerates any soil type, grows well in shady corners and when soil moisture is adequate.
PestsLeaf and twig blight, leaf spot, canker, root rot.
HabitatHorticultural origin.
Bark/Stem DescriptionA green colour during the growing season, but turning yellow–green in winter.
Flower/Leaf Bud DescriptionGreen-brown or coloured varied, usually 5 exposed scales.
Leaf DescriptionSimple, alternate leaves, ovate to lance-shaped, bright green colour.
Flower DescriptionBright yellow, 3.8 cm across, 5 petaled, in full sun the colour fades to a bleached yellow or cream.
Fruit DescriptionAchene, seldom seen, not very showy.
Colour DescriptionStems are distinct yellowish green to bright green in winter, otherwise a rich clear green. Leaves are a light green while flowers are a cream–yellow mix.
Texture DescriptionFine in winter and smooth.

Photographs