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Determining the effectiveness of sugar as preservatives for flowersFeatured science projectScience project video


It was observed that adding sugar to water will help the flowers last longer. However, the optimum sugar concentration differed for the three species of flowers.

The Lilies were able to stay fresh for the longest number of days when the amount of sugar added was increased to three teaspoons – the optimal sugar concentration level may not have been reached yet. However, roses and carnations have a shorter lifespan when the sugar concentrations were high. These two species wilted after almost the same number of days when two or three teaspoons of sugar were added. Hence, it can be concluded that the optimum amount of sugar that roses and carnations can tolerate is two teaspoons of sugar – any amounts higher than that has no effect on prolonging the lifespan of roses and carnations.

Species of flower Number of days that the flowers stayed fresh corresponding to the amount of sugar added
  No sugar 1 teaspoon 2 teaspoons 3 teaspoons
Rose 2 3 4 4
Carnation 3 4 5 5
Lily 5 6 7 8

Use the graph below to plot the results of the observations recorded in the table above.

flowers science fair project

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Complexity level:
Project cost ($):
Time required:
Preparations of the experimental setup will take approximately one day, after which observations will be carried out over a period of ten days
Material availability:
Easily found at a florist
Safety concerns:

Basic safety requirements