Science Experiments for Kids: Make Stalactites and Stalagmites

In our series of fun science experiments for kids to try at home, you can grow your own Stalagmites and Stalactites!

What you'll need:

  • Two jars

  • Water

  • Epsom salts

  • String

  • Small weights

  • Plate

How to Conduct the Stalactite and Stalagmite Experiment

Fill two jars with warm water. Mix in Epsom salts until no more will dissolve. Wet the string and tie a weight to each end (we used 1cent coins wrapped in cling film). Drop one end of the string into each jar.

Put a plate between the two jars, with the string hanging over the plate. 

Check at least once a day to see if stalactites and stalagmites have formed.

How do you know which are Stalactites and which are Stalagmites?

Stalactites – Hold on TIGHT (they hang down), the MIGHTY Stalagmites stand up tall

Did you try growing stalactities (and stalagmites)? How did it go? Tell us in the comments below!

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This website was created by Jill Holtz and Michelle Davitt, both of whom are mothers of young children. Jill and Michelle decided to create this resource themselves, and launched in 2007.