Growing Seeds in a Plastic Bag Preschool Activity for Kids Ages 3-5

Growing seeds in a plastic bag preschool activity is a simple way to explore plant growth with young children. Using lima beans, kids ages 3–5 can clearly see roots and leaves form over time.

This life cycle activity builds observation skills, patience, and early science understanding. Children learn what seeds need to grow while watching real changes each day.

With just a few materials, you can create a hands-on learning experience. This version also lets children move from sprouting to growing in soil.

How do you do growing seeds in a plastic bag preschool activity?

Place a wet paper towel and lima bean inside a plastic bag and tape it to a sunny window. After the seed sprouts, add soil to the bag and leave it slightly open. Children can watch roots, stems, and leaves grow step by step.

What Is This Seed Activity?

This simple seed activity gives young children a hands-on way to learn how plants grow. This simple activity shows each stage of growth in a clear and visual way.

Children start by placing a seed on a wet paper towel inside a plastic bag. As the seed sprouts, they can observe the roots begin to grow.

Then, children add soil to the same bag so the plant can continue growing. They watch leaves form and grow bigger each day. Children can see both roots and leaves clearly, which makes learning easy and exciting.

Why Use Lima Beans for This Activity?

Lima beans work very well for this spring science activity with preschoolers. Their large size makes them easy for small hands to hold and easy for children to see as they grow.

They also grow quickly, which helps children stay interested and engaged. Within a few days, children can begin to see changes like swelling, roots, and small sprouts.

Lima beans grow strong roots and big leaves, which makes each stage of growth easy to observe. Lima beans are perfect for preschool because children can see every change.

Materials Needed

You only need a few simple materials to set up this seed activity with preschoolers.

• Lima beans
• Paper towel
• Plastic zipper bag
• Spray bottle with water
• Tape
• Soil
• Small container (for later planting)
• Paper plate
• Small shovel

Tip: Prepare 2–3 bags in case some seeds do not grow. This gives children more chances to observe changes.

Step-by-Step Directions

Step 1: Start the Seed (Sprouting Stage)

Children begin by setting up the seed so they can watch it sprout. This step is simple and exciting to start.

Fold the paper towel so it fits inside the plastic bag.
Place 1–2 lima beans inside the bag against the paper towel
Spray the paper towel until it is fully wet but not dripping

Make sure the beans are clearly visible from the outside
Seal the bag
Tape the bag to a sunny window at child height

Explain to the children that the seed will begin to change in a few days.

Step 2: Observe Daily Growth

Now children watch and track how the seed changes each day. This is where the most learning happens.

Check the bag together each day
Look closely for changes like swelling, roots, and small shoots

Notice how the root grows longer over time
Talk about what is happening using simple questions:

• “What do you see today?”
• “Is the root getting longer?”

This step helps children slow down, observe, and talk about what they notice.

Step 3: Add Soil to the Bag

Now children move from sprouting to growing a plant. This step helps them see how the seed continues to develop.

Once roots and small leaves appear, open the bag

Add soil inside the bag

Place the sprouted bean gently into the soil

Leave the bag slightly open
Return the bag to the sunny window
Important: Leaves need space and air to grow.

Step 4: Move to a Container

Now children move the plant to its final growing space. This helps them continue observing as the plant gets bigger.

Continue observing how the plant grows each day
When the leaves grow larger, carefully remove the plant from the bag

Transfer the plant into a small container filled with soil
Gently add more soil around the roots
Place the container in a sunny spot

What Will Preschoolers Observe?

Children will see clear changes in the seed and plant over time. This helps them understand how plants grow step by step.

• Day 1–2: The seed swells as it takes in water
• Day 3–5: Roots begin to appear and grow longer
• Day 5–7: A small sprout starts to grow upward
• After adding soil: Leaves grow bigger and stronger

Explain to your preschoolers that roots grow down and the plant grows up.

Lima Bean Growth Stages Chart

Stage	What Kids See	What Is Happening
Day 1-2	Seed swells	Seed takes in water
Day 3-5	Root appears	Root starts growing down
Day 5-7	Sprout grows	Stem begins to grow up
After soil	Leaves grow bigger	Plant continues growing

Simple Science Concepts to Teach

This activity is a great way to introduce basic science ideas in a simple and clear way. Keep explanations short and easy for preschoolers to understand.

• Plants need water, light, and air to grow
• Roots take in water from the soil
• Leaves help the plant grow and make food

You can also read books about how plants grow and change over time. Check out these life cycle of a plant picture books for preschoolers.

Optional:

• Show the veins in the leaves and explain that water moves through the plant

Tips for Success

Use these simple tips to help the activity go smoothly and keep plants growing well.

• Do not add too much water. The paper towel should be wet but not dripping
• Keep the bag in a sunny window so the plant gets enough light
• Set up 2–3 bags in case some seeds do not grow
• Make sure the beans stay visible so children can observe changes
• Open the bag once leaves begin to grow so the plant has air

Easy Extension Ideas

You can extend this activity with simple ideas that keep children engaged and learning.

• Draw the plant each day to track changes
• Compare two beans and notice which one grows faster
• Measure plant growth using blocks or small objects
• Look closely at leaf veins and talk about what you see
• Plant the sprout in soil and continue watching it grow

This simple seed activity gives preschoolers a clear and exciting way to see how plants grow. From the first sprout to growing leaves, children can observe each step and build early science skills through hands-on learning.

By checking the plant each day, children practice patience, observation, and curiosity. They begin to understand what plants need and how living things change over time.

With just a few materials, you can create a meaningful learning experience at home or in the classroom. This activity is easy to set up, fun to watch, and a great way to introduce young children to the world of plants.

Try this activity with your preschooler and watch how excited they get as their plant grows each day.