STEAM Activity: How to Create an Indoor Greenhouse

winter terrarium activity on blue background

STEAM Activity: How to Create an Indoor Greenhouse

Who needs to wait for spring to see plants growing? With this fun craft, your little gardener can work on their green thumb all winter long.   

At Primrose schools, teachers provide STEAM-based learning (Science, Technology, Engineering, Arts and Math) through hands-on learning experiences every day. In December, our Balanced Learning® curriculum helps students learn about greenhouses and indoor gardening, and you can enjoy some of these same lessons at home with the craft below. 

Soda Bottle Winter Terrarium (ages 3+)  


  • clean, empty 2-liter soda bottle (clear plastic) 
  • potting soil 
  • craft knife or scissors (grown-up use only) 
  • awl or other hole-punching tool (grown-up use only) 
  • small, non-poisonous plants or seeds, twigs, and plastic figurines 


  • Remove the label from the plastic bottle by soaking it in soapy water. 
  • Grown-Up Step: On the rounded top of the plastic soda bottle, poke small holes for ventilation all the way around the bottle (this will be the top of the terrarium).  
  • Grown-Up Step: Using a craft knife or scissors, cut off the bottom of the bottle about five inches from the base.  
  • To construct the terrarium, have your child add a few inches of potting soil.  
  • Press a finger into the soil to create small holes, then plant two or three small plants or seeds into the soil and cover.  
  • It’s time to decorate. Ask your child to add twigs, dried leaves, and plastic figurines to design their terrarium. Add a little water and then slide the top of the soda bottle down over the base. Place the terrarium near a window and watch the plants grow! 

 For more on STEAM learning at home, check out:  

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