Observations and results
When you put the flowers in the dyed water, did you see some of the flowers start to show spots of dye after two hours? Did you also see some dye in the stems? After 24 hours did the flowers overall have a colored hue to them? Did this hue become more pronounced, or darker, after 48 and 72 hours?
Water moves through the plant by means of capillary action. Specifically, the water is pulled through the stem and then makes its way up to the flower. After two hours of being in the dyed water, some flowers should have clearly showed dyed spots near the edges of their petals. The water that has been pulled up undergoes a process called transpiration, which is when the water from leaves and flower petals evaporates. However, the dye it brought along doesn't evaporate, and stays around to color the flower. The loss of water generates low water pressure in the leaves and petals, causing more colored water to be pulled through the stem. By 24 hours the flowers should have gained an overall dyed hue, which darkened a little over time. The stems should have also become slightly dyed in places, particularly where the leaves branch off.
More to explore
Plant Parts: What Do Different Plant Parts Do? from Missouri Botanical Garden
Capillary action from The U.S. Geological Survey, Water Science School
The Water Cycle: Transpiration from The USGS Water Science School
Transpiration in Plants from TutorVista.com
Suck It Up: Capillary Action of Water in Plants from Science Buddies
This activity brought to you in partnership with Science Buddies