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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