Patriotic Color Changing Flowers

This patriotic color changing flowers experiment is a simple preschool science activity that helps them see how plants move water through their stems. Using red and blue colored water and white flowers, children can observe petals gradually change color while learning about capillary action. It’s a great addition to a Fourth of July theme, summer learning unit, or patriotic preschool lesson.

How do color changing flowers work?

Color changing flowers demonstrate capillary action, the process that allows water to travel up a plant’s stem. When white flowers are placed in colored water, the dyed water moves through the stem and into the petals, causing them to change color over time.

Patriotic Color Changing Flowers Science Experiment

This summer science experiment lets preschoolers observe how plants absorb water as white flowers gradually turn red and blue in colored water.

Supplies

• White flowers (daisies, carnations, or mums work well)
• 2 small clear jars or bottles
• Water
• Red food coloring
• Blue food coloring
• Knife or flower snips (adult use only)

How to Make Patriotic Color Changing Flowers

1. Prepare the Colored Water

Fill one jar halfway with water and add 25–30 drops of red food coloring.

Fill a second jar halfway with water and add 20–25 drops of blue food coloring. Stir gently.

2. Trim the Flower Stems

Cut the stems at an angle before placing them in the water. This helps the flowers absorb water more easily.

3. Place the Flowers in the Jars

Put one flower in the red water and another in the blue water.

4. Observe the Changes

Set the jars in a sunny location or somewhere children can easily observe them throughout the day. Check the flowers every few hours and watch as the petals begin changing color.

5. Compare Results

After several hours or overnight, the flowers will show beautiful red and blue tints that create a patriotic display.

The Science Behind the Experiment

Flowers need water to survive. Tiny tubes inside the stem carry water from the roots to the petals and leaves.

When food coloring is added to the water, children can actually see this process happening. As the flower absorbs the colored water, the dye travels through the stem and into the petals.

This process is called capillary action and is one of the easiest plant science concepts for preschoolers to observe firsthand.

Try This Variation

For an even more dramatic result, carefully split a flower stem down the middle and place one half in red water and the other half in blue water.

Children will be amazed to see a single flower develop two different colors.

Questions to Ask Preschoolers

Encourage observation and prediction skills with questions like:

• What do you think will happen to the petals?
• Which color will appear first?
• How long do you think it will take?
• What do you notice now that wasn’t there earlier?
• Why do you think the flower is changing color?

Tips for Using This Activity

• White carnations typically produce the most noticeable color changes.
• Cut the stems just before placing them in the colored water to help the flowers absorb more water.
• Use plenty of food coloring for vibrant red and blue petals.
• Place the jars where children can easily observe the flowers throughout the day.
• Encourage kids to make predictions before the experiment begins and compare their predictions to the results.
• Take photos every few hours to create a simple science journal showing the changes over time.

Extend the Learning

Try a Two-Color Flower

Carefully split a flower stem in half and place one side in red water and the other in blue water. Ask children to predict what the petals will look like the next day.

Create a Flower Observation Journal

Invite children to draw or photograph the flowers at different stages of the experiment. Compare the changes and discuss what happened over time.

Explore Other Colors

Repeat the experiment using different food coloring combinations. Compare the results and talk about which colors were easiest to see in the petals.

Measure and Compare

Place several flowers in colored water and compare how quickly each one changes. Children can count petals, compare sizes, or sort flowers by the amount of color they absorbed.

Read Books About Flowers and Plants

Pair the activity with books about how plants grow to reinforce the concepts children observed during the experiment.

This patriotic color changing flowers experiment is an easy way to combine holiday fun with hands-on science. As children watch white flowers turn red and blue, they can observe changes over time, make predictions, and learn more about how plants use water. Best of all, it requires only a few simple supplies and creates a memorable learning experience for summer.