Grass seeds are the fastest, most forgiving first plant for preschoolers to grow — they germinate in 3–5 days and grow visibly between observations, rewarding children's patience with rapid, dramatic progress. Growing grass in a paper cup gives each child ownership of their own growing experiment and creates a daily observation ritual that builds the habit of scientific attention to change over time.

What You'll Need

• Paper or plastic cups (one per child)
• Potting soil or seed-starting mix
• Grass seed (ryegrass or wheatgrass sprout fastest)
• Water sprayer
• Sunny windowsill
• Rulers for measuring growth

Growing Instructions

1. Fill the cup with moist potting soil to about 2 cm from the top.
2. Scatter grass seeds generously across the surface — no need to be sparse.
3. Gently press seeds into the soil surface.
4. Cover with a thin layer of soil and mist with a spray bottle.
5. Place in a warm, bright location. Keep the surface moist (not waterlogged) daily.
6. First sprouts appear in 3–5 days. Measure and draw daily.
7. Once grown, children can decorate the cup as a face — the grass becomes the hair. Trim with scissors!

Science Vocabulary to Introduce

• Germination: when a seed sprouts and begins to grow.
• Seedling: a very young plant just emerged from the seed.
• Roots, stem, blade (the grass leaf).
• Photosynthesis: how plants make food from sunlight (introduce the concept simply).

Frequently Asked Questions

What if the grass is not sprouting after 5 days?

Check for: soil that is too dry (water more often), soil that is too wet (poke a hole in the cup base for drainage), insufficient warmth (move to a warmer spot), or seeds planted too deep. Old seeds may also have low germination rates — use fresh seeds from the current season. Wheatgrass is the most reliable variety for indoor preschool growing and can be found at natural food stores as well as garden suppliers.

Related activities: Plant Sunflower Seeds | Grow Herbs Indoors | Caterpillar Growth