Orixa japonica (Japanese Orixa)


Michael's Opinion

Orixa japonica is an ornamental, deciduous shrub which produces adventitious roots producing a spreading plant that is wider than tall at maturity. It is a very tolerant plant but prefers full sun to partial shade. The foliage when crushed releases a potent smell and unlike other members of the Rutaceae family butterflies and other insects reject plant.

Botanical Information

FamilyRutaceae
GenusOrixa
Speciesjaponica
CategoryWoody
TypeShrub (deciduous)
OriginNative to Japan.
Pronunciation

Details

USDA Hardiness Zone6-7
USDA Hardiness Ref.
Canadian Hardiness Zone5a
Canada Hardiness Ref.
RHS Hardiness ZoneH7 - H6
RHS Hardiness Ref.
Temperature (°C)-28 - 12
Temperature (°F)-20 - 10
Height1.8 - 2.4 m
Spread2.4 m +
GrowthMedium
Flowering PeriodApril, May

Description and Growing Information

General DescriptionA low branching spreading plant due to its adventitious roots becoming wider than tall at maturity. Light green flowers are produced on last seasons wood. The leaves are obovate, simple, alternate, slightly scalloped, lush green and glabourous turning pale yellow in autumn
ID CharacteristicAn intensely potent smell is released when the foliage is crushed.
ShapeMounded, wider than tall at maturity.
LandscapeA dense plant with landscape uses include hedging, massing or as an informal shrub.
PropagationSeed may be sown outdoors in a cold frame (collected when fresh), when seedlings are large enough they should be 'pricked-off' into pots and grown on in the greenhouse for at least the first winter. Semi-hardwood cuttings taken in late July to August collected with a heel produce above average results when rooted in a frame with mist and bottom heat. Root cuttings about 3-5 cm long and taken during the dormant season will also produce reliable results.
CultivationPrefers well drained nutrient rich soils in full sun to partial shade. It is a salt tolerant species.
PestsDeer-resistant and pest resistant
Notable SpecimensMichael Dirr notes in his 'Manual of Woody Landscape Plants' a mature specimen at the Arnold Arboretum, in Jamaica Plains, Massachusetts growing in partial shade. Also found at the Royal Botanical Gardens, Burlington, Ontario, Canada.
HabitatFound at elevations to 180 m in scrub, cliffs and woods.
Bark/Stem DescriptionLight grey, smooth bark.
Flower/Leaf Bud DescriptionBuds are produced off of the leaf axils of previous years growth and are obovate in shape to about 2 cm long.
Leaf DescriptionGlabourous, obovate mature leaves that are slightly scalloped and a rich green turning pale yellow in autumn to 7 cm in length, leaves begin to emerge late March.
Flower DescriptionDioecious flowers, blooming from previous years growth in April- May.
Fruit DescriptionSymmetrical 4 sectioned fruit in shell like pod, 2 cm in length, with one, round black seed per pod.
Colour DescriptionRich green, turning pale yellow in autumn.
Texture DescriptionGlabourous leaves, smooth bark.

Photographs