Koelreuteria paniculata
Goldenrain tree, lantern tree, varnish tree, koelreuteria: native to China, it has several names that sum up its two seasonal displays. In summer, a “golden rain” of yellow panicles covers its crown; in autumn, these flowers give way to paper-lantern-shaped fruits, pink then brown, which remain on the tree for a long time.
Characteristics:
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Summer yellow flowering: large upright panicles in July and August, during a season when few trees flower.
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Lantern-shaped fruits: translucent, swollen capsules that are highly decorative and remain until winter.
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Small-garden tree: 6 to 8 metres tall, with a globular crown that becomes spreading with age and smooth grey bark.
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Remarkable longevity: slow but steady growth; it can live for up to 200 years.
Precautions:
- The saponins present in its bark and fruit make them unfit for consumption. Their traditional use in Asia is domestic—the production of natural soap, hence its French name—not culinary.
- It breaks dormancy late in spring: do not assume it is dead; it simply starts growing later than other trees.
Sowing advice:
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Position: full sun, without compromise—hot summers produce the most abundant flowering.
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Soil: compact or very porous, calcareous and rather dry. It tolerates difficult soils and drought remarkably well once established, but dislikes waterlogged or acidic soils. No fertilisation is needed.
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Method: its black seeds have a very hard seed coat. Lightly scarify them with a file or soak them for 24 hours in lukewarm water, then apply cold stratification for 2 to 3 months. Then sow in spring in a deep pot.
Planting advice:
- Transplant it while young into its permanent position, using a deep pot to accommodate its taproot. Its rounded habit and moderate growth make it perfect for small gardens and urban courtyards.
- It is also suitable for bonsai—see our guide creating a bonsai from a seed.
Care advice:
- Water regularly during the first two years; afterwards, the tree becomes self-sufficient. Minimal pruning, at the end of winter.
Beneficial combinations:
Benefits for biodiversity:
- Its midsummer flowering fills a quiet period for pollinators, when most trees have finished flowering: it provides a valuable source of nectar during the driest season.
- Its dry lanterns shelter small insects in winter, while its light foliage lets sunlight through to a flowering understorey.
- Its tolerance of drought and compacted soils makes it a tree of the future for warming cities.
Uses:
- An ornamental tree for use as a specimen, in rows or in small gardens, valued for its threefold appeal: summer flowering, decorative fruit and golden autumn foliage. Its lanterns are suitable for dried arrangements.
Symbolism:
In China, the goldenrain tree was among the trees planted on the graves of scholars, according to a highly codified protocol. Its longevity makes it a symbol of continuity and the passing down of knowledge.
Harvesting your own seeds:
Open the dry lanterns in autumn: each contains three black seeds, round and hard as pearls. Dry them before scarification and winter stratification. See how to store your seeds.
Commitment to Quality: at SemiSauvage - Permaculture, we grow and select our seeds with respect for living things as our guiding principle. Based near the Auvergne Volcanoes, we choose open-pollinated, non-hybrid varieties, tested for their germination rate, sorted and carefully packaged, without any chemical treatment. Our conviction: to give gardeners back the ability to resow, year after year, seeds that truly belong to them.
A tree that flowers when the others have finished: add the goldenrain tree to your garden.
