This Soda Bottle Compost is a great way for kids to see composting in action. The clear 2-liter bottle makes it easy to watch the composting process as it happens. We love finding new ways to use materials we already have around the house to use with science projects for kids. This recycled science project is a great way for kids to learn about composting in a hands-on way.
My kids are nuts about science so we’re always looking for projects we can do at home that really allow them to get hands-on and see the things we are learning about. With spring weather teasing us around here, we’re thinking about planting a garden, so learning about how to create compost was a great place to start.
This simple kids’ science activity uses an empty 2-liter soda bottle and some things you have around your house and yard to teach kids about how compost is made. The clear soda bottle is perfect for keeping on eye on the changes that are happening within your compost and it’s a great way to recycle something that would have otherwise ended up in the trash.
Read Also: How Does a Seed Grow
- Empty 2 Liter Soda Bottle
- leaves, grass, newspaper, spoiled produce, and anything else you can find in your home or yard that can be composted
Cut the top off a 2 liter soda bottle and rinse it out well. Remove the label so that you can see everything inside the bottle well.
Start with a layer of soil on the bottom and alternate between soil and compostable material. You can use just about any plant matter. We had some peas that were getting mushy in our fridge so we threw those in with some dead leaves, grass, and pine cones. Shredded newspaper would have been great in here too.
I set my 6-year-old loose in the yard and had him look for anything that came from a plant. Older kids can alternate green matter and brown matter in their compost and experiment with different levels of moisture on the rate of decomposition.
Feel free to get emotionally attached to your compost bottle.
When your soda bottle has been filled, add water so it can start composting. You don’t want it to be sitting in water but you do want it to be damp all the way through.
Let your compost sit for several weeks in a spot where it will get plenty of sunlight and won’t be tipped over.
Watch as the material that you have added to your soda bottle compost bottle changes over time.
Kids may want to keep a record of the changes by taking photos or drawing pictures of what is happening in a science notebook.
This is a great introduction to composting for kids.
To learn more about gardening with your kids, we recommend these:
What is a Hypothesis
Even young kids can be introduced to some basic science. After we were done creating our compost soda bottle, my kids and I talked about the scientific method and what a hypothesis is. Brain Pop is a great resource for explaining concepts to kids and they have a really fun video on the scientific method. It is a subscription service but they have a selection of free videos that rotates so you may get lucky, although it’s well worth the subscription.
Older kids can keep a scientific journal and write down their hypotheses and record observations as their compost pile changes. Younger kids can make a hypothesis about what will happen and keep an illustrated journal by drawing pictures of the changes they see happening.
Composting for Kids
Once you have been successful composting in a soda bottle you can move on to longer-term options. Composting is a great way to dispose of organic waste and create some nutrient-rich soil for your garden.
This soda bottle composting project, while fun, does not create the volume of compost that you would need for a full garden. Once your kids see how the composting process works, it is a great idea to move onto larger composting options.
The Envirocycle has great reviews and has been called “The most beautiful composter in the world”. This is a solid choice for your next step in composting. Made from food-safe, BPA and rust free, UV and antioxidant protected materials, your kids can safely use this with your help.
Having a countertop compost bin makes it easier to stick with composting. This model from Oxo locks in odors and blends in with your kitchen. Having it on hand makes it easy to throw in your vegetable scraps and gives you a place to store them until you take them out to the full-size composter.