This is our cress caterpillar. You can see in the photo that 3 of the segments are a lighter shade of green than the other three. Can you guess why this might be?
How to grow a cress caterpillar
- cress seeds
- an egg box, cut into segments
Cress Caterpillar Instructions
- Place some cress seeds in each segment of the egg box.
- Place three segments on one plate or tray and three on another plate or tray.
- Add water to all, and place one plate on a windowsill and one in the dark.
- Water frequently.
The cress should grow within a few days. I gave my ‘in the dark seeds’ a little light to help them grow, which is why they are slightly green.
Why are the cress leaves green?
I was very surprised that the seeds grew so well without any soil. They got everything they needed to grow from the water and nutrients stored in the seed.
Green plants make sugar for growth through a process called photosynthesis.
Carbon dioxide + water (and light ) ———> glucose and oxygen
Photosynthesis takes place in chloroplast cells, which contain a substance called chlorophyll which makes plants green.
Sunlight is also needed to make chlorophyll; this is why the cress seeds exposed to less sunlight are less green than those kept in the sun.
More plant and seed science for kids
Make an edible butterfly life cycle; use our free template to make it easy!
Dissect a flower to learn about the different parts.
Grow a bean in a jar!
Find out about leaf transpiration with Teach Beside Me.
Last Updated on March 26, 2023 by Emma Vanstone