Coffee Compost: Exploring the Science Behind Composting

By National Inventors Hall of Fame

When you think about saving the planet, you might think about reducing carbon emissions by carpooling, riding a bike, or even purchasing an electric vehicle. While these are all great ways to save the planet, there are also a lot of simple things you can do everyday to help protect our planet. Any day is a good day to reuse or recycle materials. Here are some great ways to reuse coffee waste for composting and gardening. By incorporating these steps into your daily routine you can help reduce waste and protect our planet!

What are we learning?

Humans have been drinking coffee since the 15th century. It has been brewed in many different ways over time, but the process always involves pouring boiling water over ground coffee beans. In 1948, an American inventor and NIHF Inductee, Percy Spencer, invented a special coffee brewing device that harnesses the power of microwave energy.

Because coffee is such a popular drink, used grounds are common in many homes. Often, the grounds are thrown out. However, families can repurpose them to use as composting material. Because coffee grounds are an effective nitrogen source, they are especially effective when mixed with other compostable materials. Creating compost is a great way to reduce landfill waste and create a useful material many people dispose of daily.

Materials:

  • Coffee filters
  • Used coffee grounds
  • Leaves
  • Grass clippings
  • Craft supplies (stickers, fabric, decorative tape, etc.)
  • Drawing utensils (crayons, markers, paints, pencils)
  • Used single-use coffee pods
  • Paper
  • Planting soil
  • Scissors
  • Small plants or seeds
  • Tape
  • Water
  • Outdoor area for compost

Instructions:

Part 1: Create Compost

  1. Brew a cup of coffee and explain to your kids that the used grounds can be reused to aid plant growth!
  2. Before using these old grounds in a new way, set aside an area in your yard where you plan to make your compost pile.
  3. For one month, mix and spread your used grounds and coffee filters along with grass clippings and leaves across your designated compost area. The mixture should have an equal amount of each ingredient.
  4. This composted material can now be used as fertilizer for flowers and plants in your home or garden!

Part 2: Upcycle Coffee Pods

  1. While the convenience of single-use coffee pods has made the process of brewing coffee easier than ever, unfortunately, they create a large amount of plastic waste. To mitigate these effects, repurpose these pods by turning them into miniature planters.
  2. Have your children sketch their ideas. Will their planter use one pod or many? How will they attach the pods to each other?
  3. Using tape, scissors, paper, crayons and other craft supplies, have participants design and decorate their planter.
  4. Next, fill each planter with soil by placing one small plant or seed in the center of each.
  5. Water each cup regularly to keep them growing.
  6. If you created compost, add a pinch to each cup to act as a fertilizer.
  7. Show off your upcycling prowess by taking a photo of your coffee creations and tagging NIHF on social media! We always love to see your innovative creations!

National Inventors Hall of Fame® (NIHF) is recognizing inventors and invention, promoting creativity and advancing the spirit of innovation and entrepreneurship.

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