Tulips intrigue us again and again

We are all familiar with tulips. But there are also mysteries. For example, why do they continue to grow in the vase? And why do they close their flowers at night?
Tulips continue to grow in the vase
Have you ever noticed that tulips in a mixed bouquet start to outgrow the other flowers after only one day in the vase?

They're even particularly zealous. Because they will majestically overhang the rest of the bouquet after three to four days. What happened?
Addicted to water
In the plant world there is, among other things, the principle of elongation growth. In an initial phase, the plant does form the cells that are important for growth by cell division, but after that it only grows by stretching the cells. These grow because they absorb more and more water in their interior and thereby expand lengthwise.

Now, what makes the tulip different from other flowers is that it continues to grow for a few days by absorbing water from the vase, even as a cut flower.
Why do tulips close their flowers at night?
It is not the lack of light that causes tulips to close their corolla at night, but the lack of heat. As the air surrounding the tulip cools, the outer part of the petal begins to grow.

The petals then curve inward and the corolla closes. But when the heat increases, the inner part of the petals grows and the petals curl outwards.
When do tulips open their flowers more quickly?
On very warm days, tulips even open to the point where the petals overhang. Botanists call this movement, triggered by temperature stimuli, "thermonasty." It is repeated dozens of times during the blooming period. By the way, the blossoming of a tulip bud is also mainly dependent on temperature.

This is because when closed tulips are in water at about 30 degrees, they open their flowers much faster than in cold water.

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