Sponge Sprouts

Looking for a fun, kid-friendly, DIY science project? We’ve got just the thing. This Sponge Sprouts DIY project is a great way to learn about the plant cycle and the basic needs of plants. No green thumb required! The creative possibilities are endless with this project.

To learn more about the science behind this project, head to our kid-friendly (and free) Plants and Seeds lesson.

Here’s what you’ll need:

1 flat sponge, any size

Small amount ( about ½ tsp) of rye grass seed (Other seeds work, too, so feel free to give them a try!)

1 plate or tray

(Optional) Garden decorations

Here’s how it’s done:

  1. Rinse the sponge several times to make sure it is clean.
  2. Cut the sponge into any shape you’d like. Use a marker to outline your shapes. We made a flower, turtle, and a face! You could make a car, dog, or a lion. Anything goes!
This pattern is a sea turtle. 

3.  Place your sponge on a plate or tray.

Place the sponge on a plate.

4.  Cover the sponge with one layer of the seeds. One layer is all you need! Thicker layers might not grow as well.

5.  Bonus: Add a decoration if you’d like! It’ll become hidden when the seeds sprout!

Add a single layer of seed. Thicker is not better. You can also add a garden decoration if you like.


6.  Fill the bottom of the plate with water and place it in a window or bright area in your house. Direct sun is not required.

7.  Let the seeds grow! It’s important to make sure that there is always water in the plate to keep the seeds moist. Make sure to check on it at least once a day!

8.  After several days, the seeds will sprout! After a few weeks, you’ll need to give your grass a trim! The grass will continue to grow as long as you keep water in the plate.

It’s so much fun to trim every few days!


Extra tip: If you’d like your seeds to sprout faster, you can place a piece of plastic wrap loosely over the whole project until the seeds begin to sprout. Make sure to unwrap the plastic and check the water daily!

So fun! We’d love to see your sponge sprouts! Send a picture of your project to The Winkle on Instagram (@thewinklecrate) and check out our site for more fun projects. Subscribe to The Winkle Crate for 4 kid-friendly STEM projects – with all the supplies you’ll need – sent straight to your door each month.

Here is another design idea. It’s pretty funny when the grass grows! 
Portrait of dad?
This is a box turtle. It has a double layer for the shell. 
You can’t go wrong with a flower in your garden.

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