This Leucospermum conocarpodendron subsp. conocarpodendron was grown from seeds over 200 years old – among the longest living seeds ever.
It was recently planted in the Temperate House, ready for the opening on 5 May. But the plant’s history stretches back much further than this new home.
The seeds were tucked away in a red leather-bound wallet from 1803 until 2005. A researcher discovered them unexpectedly, while looking into the High Court of Admiralty Prize Papers in the National Archives.
They weren’t the only seeds found. In total, there were 40 seed packets in the wallet, each labelled with species annotations.
Some labels were more mysterious, with one listing simply: ‘Seeds from a tree with crooked thorns’.
The wallet also contained Chinese silk, an envelope with a lock of dark hair, and a prayer written in the centre of a flower cut out from paper.
The seeds were brought to Kew, conveniently very close to the National Archives.
Scientists at Kew tried to germinate the seeds, based on the knowledge that they were from the Cape Region of South Africa. Germination tests included treating the seeds with liquid smoke to replicate the wildfires which enable seed germination in several species from the region.
They had initial success with three species, labelled as: ‘Liparia villosa’, ‘Protea conocarpa’ and an ‘unknown Mimosa’.
Using the International Plant Names Index, scientists traced their likely modern botanical names to identify the plants. They found that ‘Protea conocarpa’ was in fact a Leucospermum.
Out of eight Leucospermum seeds, only one germinated – the one that survives today.
Once germinated, the plants were grown in pots. Only the ‘unknown Mimosa’ (an Acacia), and the Leucospermum survived to maturity.
Scientists were then able to identify it as a Leucospermum conocarpodendron subsp. conocarpodendron.
Since then, the plant has grown significantly and is still flourishing.
March 1803 – Seeds found by Jan Teerlink in Cape Town, South Africa. They were kept, alongside Chinese silk from Teerlink’s earlier trip to China, in his red leather-bound wallet.
1803 - Jan Teerlink’s ship Henriette captured on the way back to Holland from Cape Town. 41 packets of seeds were among documents and items found on the ship.
1803 – Seeds kept in the Tower of London
1857 - Seeds moved to Chancery Lane
1996 – Seeds stored in National Archives
2005 – Seeds discovered by researcher Roelof van Gelder
2006 – Seeds germinated by scientists at Kew’s Millennium Seed Bank
2018 – Leucospermum conocarpodendron subsp. conocarpodendron planted in the Temperate House
See how the 200 year old Leucospermum conocarpodendron compares with some of the other oldest recorded seeds:
It is known that Leucopsermum seeds can survive in soil for around 80 years. This Leucospermum conocarpodendron subsp. conocarpodendron survived in conditions that were both cooler and more humid than usual, and for more than 100 years longer than had previously been expected.
This makes Leucospermum conocarpodendron subsp. conocarpodendron a real survivor.
You can find the Leucospermum conocarpodendron in the Africa section of the Temperate House, alongside other plants from the region from turquoise hyacinth to aloe jucunda.
By giving to this iconic building today, you can ensure our continued botanic heritage.