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TULIP
MANIA

 LEIDEN

Image by thomas heintz

Planter experiment @ Hortus

Planter project Hortus and Tulip Mania

In addition to the citizen science project, where tulips are planted in various gardens of Leiden's residents, Tulip Mania Leiden is working closely with the Hortus Botanicus and the Leiden Center for Applied Sciences on a more controlled experiment. On November 24, 2021, organic tulip grower and soil coach John Huiberts planted, together with Hortus employee Theo Houthoff, red organic Tulipa Masterpeace tulips in 11 planters, one of which is filled with just sand as a control, and the others with two different kinds of soil, i.e. soil from John's own tulips fields, or the "Leidse mix" soil that is used by the city of Leiden in green spaces. In the spring, when all tulips are growing and blooming, samples of the soil will be collected from each planter and analyzed using metagenomics. 

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Theo Houthoff and John Huiberts fill the planters with different types of garden soil.

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De groei van de Masterpeace tulpen gedurende een maand, in één van de geteste grondsoorten. 

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De groei van de Tulipa Masterpeace tulpen  in April, 5 maanden na planten van de bollen.

Festive tulip planting in de Hortus!

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Behind the planters are people who are involved in the Tulip Mania project. On the right, initiator, Dr. Leonie Kaptein 

On December 14th, 2021, during the winter afternoon at the Hortus, the tulip bulbs with a different color were added to the planters with the previously planted red Tulipa Masterpeace tulips. This was done to show what that tulip will look like in the spring, because one in 25 sold tulip bulb bags contains one such a different tulip. Anyone who will see this tulip grow among the red Tulipa Masterpeace tulips can have their soil analyzed using metagenomics. The planting moment was a festive continuation of the earlier planting moments that took place in the fall. In addition to Tulip Mania initiator Leonie Kaptein, Arjen Speksnijder was present on behalf of the Leiden Centre for Applied Biosciences, Carla Teune and Theo Houthoff on behalf of the Hortus.  

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Carla Teune talks about the history of tulips and the role of the Hortus.

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De tulip bulbs with the deviating color are planted between the red Tulipa Masterpeace bulbs. In the spring everyone can see what color the tulip has! If you bought a bag with bulbs and this tulip shows up, you're the lucky winner to get your soil analyzed using metagenomics.

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Students of SV Nucleus selling the Tulip Mania bags at the Hortus.

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The goal of  the Tulip Mania project is to make the hidden life in the soil visible using metagenomics whereby the DNA of all the micro-organisms in the soil is analyzed.

Foto's: Simone Both

Sampling the soil after blooming

At the end of April 2022, after the bloomimg season, samples were taken of the soil around the  tulip bulbs from the winners' gardens of the citizen science project and from all the Tulip Mania tubs at the Hortus. All DNA is isolated from these samples and the micro-organisms are mapped using metagenomics. The analyses are performed by the LCAB (Leiden Center of Applied Sciences). The results will be announced in the fall.

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Arjen Speksnijder and LCAB student Isa Wormsbecher take samples from the tubs in the Hortus.

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Samples were taken in the gardens of the winning participants.

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The samples are placed in bags and the tulips are measured.

Lees hier meer over hoe de analyse van de bodemmonsters wordt gedaan.

Sampling the soil after blooming

At the end of April 2022, after the bloomimg season, samples were taken of the soil around the  tulip bulbs from the winners' gardens of the citizen science project and from all the Tulip Mania tubs at the Hortus. All DNA is isolated from these samples and the micro-organisms are mapped using metagenomics. The analyses are performed by the LCAB (Leiden Center of Applied Sciences). The results will be announced in the fall.

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Initiatiefnemer Tulpenmanie Leiden, Leonie Kaptein, plant narcissenbollen in de kuipen bij de Hortus.

Een van de kuipen uit het project voordat de narcissenbollen worden geplant.

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