Tree · Fabaceae family
Voss's laburnum
Laburnum × watereri
In short a 10-second read
Voss's laburnum (tree) grows to 5–8 m tall and 3–5 m wide when mature. It grows best in full sun to part shade, in average soil. It flowers in May; the flowers are yellow. Hardy to −29 °C.
× spread 3–5 m
Where to plant
Sun, soil, frost.
It grows best in full sun to part shade, in average soil. Hardy to −29 °C.
Sun
Tolerates several positions — choose to suit the rest of the garden.
Soil and water
average · watering: moderate
Soil: loamy, sandy, gravelly
Frost
It copes with a normal winter outdoors.
How much space it takes
Mature size.
The mature plant next to a person (175 cm).
Next to a person
Reaches maturity in about 20–50 years. The final size depends on the cultivar and the spot — we give the range from smallest to largest.
Calendar
What to do and when.
Months for Central Europe. The line shows the current month.
The year at a glance
Flowers
May · yellow
Pruning
No pruning needed — just remove dead or damaged parts (August–December).
Planting
container plant: October–April; bare-root: October–March; root-balled: October–March
Winter protection
not needed
Overwintering
It copes with winter on its own.
It overwinters outdoors without protection, hardy to −29 °C.
- Needs no protection
- Hardy to −29 °C
- Deciduous — bare in winter
Frequently asked
Quick answers.
When does Voss's laburnum flower?
In May; the flowers are yellow.
Does Voss's laburnum tolerate shade?
It tolerates part shade (3–6 hours of sun), but not full shade.
How much space does Voss's laburnum need?
At maturity 3–5 m wide and 5–8 m tall; recommended spacing 300 cm.
Does Voss's laburnum survive winter outdoors?
Yes, without protection, hardy to −29 °C.
Toxicity
Where the data comes from
The data is indicative — we are still comparing it with further sources. Last checked 20 October 2026.
Show sources (20)
- GBIF — Laburnum × watereri
- rastlinky.sk — blog e-shopu „Okrasné stromy do malej záhrady“
- Laidlaw, Laburnum Poisoning and Cytisine (J R Coll Physicians Edinb)
- NCBI/PMC — Remarks on the Poisonous Properties of the Laburnum
- GBIF Backbone Taxonomy (species/match)
- Wikipedia (EN)
- Missouri Botanical Garden - Laburnum x watereri Vossii
- Oregon State Landscape Plants - Laburnum x watereri
- RHS - Laburnum x watereri
- RHS - Shrubs and trees: light pruning
- RHS - Bleeding from pruning cuts
- RHS - Trees and shrubs: planting
- Clemson HGIC - Planting Trees Correctly
- RHS - How to grow trees
- Tox Info Suisse — Giftige Garten- und Wildpflanzen
- BfR / GIZ — Liste giftiger Pflanzenarten
- Giftzentrale Bonn (GIZ Bonn)
- Invasive plant lists — this species is not on them: Slovakia, Czechia, Germany
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