Laburnum x watereri (Goldenchain Tree)


Michael's Opinion

A very attractive tree when in flower. Fruit pods are poisonous and could be injurious to children and animals. Starts to suffer in temperatures exceeding 30°C and has marginal hardiness Southern Ontario, however, it is worth the effort.

Botanical Information

FamilyFabaceae
GenusLaburnum
Speciesx watereri
CategoryWoody
TypeShrub (deciduous)
Pronunciation

Details

USDA Hardiness Zone5–7
USDA Hardiness Ref.
Canadian Hardiness Zone6
Canada Hardiness Ref.
RHS Hardiness Ref.
Temperature (°C)-29
Temperature (°F)-20
Height4.5–7.5 m
Spread3 m
GrowthMedium
Flowering PeriodMay

Description and Growing Information

General DescriptionA spectacular shrub when in flower but when out of flower not very redeeming. Olive coloured bark adds some interest to the winter garden.
ID CharacteristicBright yellow loosely hanging pendulous racemes to 60 cm in length in late spring. Olive green and pronounced wringed tomentose terminal buds.
ShapeSmall oval shaped tree or shrub.
PropagationSeed should be scarified in acid for 15- 30 minutes and then sown.
CultivationGrows well in moist well drained soils and prefers afternoon shade.
PestsLeaf spot, twig blight, aphids, and grape mealy-bug.
Notable SpecimensBrescia College, University of Western Ontario, London, Ontario.
HabitatA hybrid between L. alpinum and L. anagyroides.
Bark/Stem DescriptionShiny olive green in colour, eventually - as the plant ages - the trunk will get a rough texture to it.
Flower/Leaf Bud DescriptionSmall in size, ovoid with 2–4 exposed silvery haired scales, Buds are 2–4 mm long.
Leaf DescriptionBright green in summer turns slightly blue in the autumn. Alternate arrangement, elliptic - oblong, 3.5- 7.5 cm long.
Flower DescriptionYellow flower racemes up to 60 cm in length. Individual florets are pea–like and bloom in late May to June.
Fruit DescriptionSmall flattened pod changing from green to brown in October. Not very attractive; pod slightly pubescent.
Colour DescriptionBright green leaves with bright yellow flower racemes in late spring. Olive green bark.
Texture DescriptionMedium-fine in leaf, somewhat coarse in winter.

Photographs