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How to Grow Grass in a Cup

By Casey Kennedy ; Updated September 21, 2017

Whether you are looking for an interesting experiment to educate your children or just want to entertain them for a little while on a hot summer day, growing grass in a cup can provide them with something creative to do. Not only will this project help teach them how things grow, but with just a few simple items you can even give them their own little patch of grass to take care of and look after.

Prepare the work area. Open a newspaper and spread it out on a flat surface to help catch falling dirt or seeds. Place the items you will be using onto the open newspaper before you begin.

Fill the cup with potting soil. Use a tablespoon to fill the cup with potting soil. Leave a space of 3/4 to 1 inch from the top.

Measure out 1/4 cup of water in the measuring cup. Slowly add water to the soil. It should be slightly damp to the touch, but be careful not to over water.

Sprinkle a teaspoon of grass seed evenly across the top of the soil. Cover the grass seed with a teaspoon of the potting soil. Check to make sure all seeds are covered.

Place the paper cup in a sunny location. Put the cup on a windowsill or next to a window where it will receive sunlight for several hours each day. Check soil dampness each day, and water when it is dry. Grass should begin to appear in six to 10 days.


Things You Will Need

  • Newspaper
  • Small paper cup (8 oz.)
  • Tablespoon
  • Teaspoon
  • Potting soil
  • Measuring cup
  • Water
  • Grass seed


  • Once the grass has started to grow and is established, it can be trimmed with scissors if a "mowed" look is desired.

About the Author


Based in Atlanta, Casey Kennedy has been writing online content since 2009. She specializes in writing about small business, careers, real estate, and ecommerce. She also enjoys writing about a variety of other subjects, including home improvement, gardening, and pet care. She attended the Academy of Art online, studying interior architecture and design while pursuing commercial flight training at Aviation Atlanta in Georgia.