Determining the effectiveness of sugar as preservatives for flowers
The experimental results are in accordance with the hypothesis that fresh-cut flowers are able to last longer when placed in solutions of sugar of higher concentration - but only up to a certain optimum level.
Besides adding nutrition (eg. sugar/flower food) to the water, the flowers should be kept in a cool place away from fruits. The water should also be changed every two days to prevent bacteria buildup.
What would happen if this science fair project were to be repeated using different additives in the water such as commercial plant food or aspirin?
The experiment can also be done using different types of flowers like sunflowers or daffodils?
How to keep flowers fresh with sugar - http://www.ehow.com/how_2221784_keep-flowers-fresh-sugar.html
How to preserve fresh flowers - http://www.bukisa.com/articles/82944_how-to-preserve-fresh-flowers
How to care of freshly cut flowers - http://www.mamashealth.com/garden/cutflowers.asp
Basic safety requirements