Japanese pagoda tree

Styphnolobium japonicumFabaceaeTree

A large legume tree from China that flowers in August and September, later than almost any other temperate tree, and produces a substantial nectar flow at the thinnest point of the year. It is planted widely as a street tree, which makes it one of the more useful pieces of urban forage that nobody planted for that reason.

Caution

The seeds and pods contain cytisine-related alkaloids and are toxic if eaten in quantity. This does not affect the nectar or the honey.

Value to bees

Nectar
High
Pollen
Moderate
As a honey crop
Minor honey crop — a surplus only locally or occasionally
Which bees, and why
Worked heavily by honey bees and bumblebees in August and September. As a widely planted street tree it is one of the more significant unintentional urban forage sources in European and American cities.
Worth knowing
A good late nectar source and moderate pollen, at a genuinely useful point in the season.

Flowering

In flower
July to September (northern hemisphere)

August and September in most of Europe, and among the latest-flowering temperate trees.

When nectar flows
Substantial from a mature tree, and valuable specifically for arriving after the main summer flows have ended.
Year-to-year variation
Trees must be mature to flower well, which takes a decade or more. Where they are planted in numbers as street trees the collective flow can be considerable.

Growing it

Conditions
Full sun, tolerant of drought, pollution and compacted urban soil, which is why it is planted along streets.
Size
15-25 m tall with a wide crown.
Native range
China and Korea, despite the common name. Planted widely as a street and park tree across Europe, North America and Asia.
Suits
Large gardens
  • Takes ten to fifteen years to flower, so plant it for the long term.
  • Exceptionally tolerant of urban conditions — drought, pollution and root restriction.
  • The fallen flowers and pods make a mess on paving, which is the usual complaint against it.

What it looks like

A broad spreading tree with pinnate leaves and large loose panicles of creamy-white pea flowers in late summer, followed by distinctive constricted green pods like strings of beads.

Sources

  • Field Guide to the Bees of Great Britain and IrelandBloomsbury (2015) · Field guide
  • HoneyHQ editorial synthesisHEKNO Ltd · HoneyHQ synthesis

How sources are selected and weighted is set out in the sources and evidence policy.

Guides covering this plant

Tools for planning planting

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