Skip to product information
1 of 4

Neptune Ball

Neptune Ball

4 total reviews

    Item #244

    This fibrous ball was part of one of the largest and oldest organisms on Earth- a clonal colony measuring 5 miles wide and around 100,000 years old. 

    Posidonia oceanica, also called Neptune grass, is a seagrass species that is native to the Mediterranean Sea. It forms underwater meadows that are a crucial part of the ecosystem. 

    This ancient plant can soak up 15x more carbon dioxide every year than a similar sized piece of the Amazon rainforest. They are home to hundreds of species of fish and the foundation of coastal food webs. 

    Seaweed balls are formed from the Neptune grass' foliage, and wash up to nearby shorelines. 

    They can bring with them debris including plastics that they have trapped along the way, helping to clean the sea in the process. 


    *Please note, this listing is for one neptune ball. Small sizes range from approximately 1" in diameter to 1.5", large sizes range from 1.75" to 3" in diameter. 

    • Research Card

    Regular price $3.00
    Regular price $5.00 Sale price $3.00
    Sale Sold out
    Shipping calculated at checkout.
    Matter Subscriber Price:

    View full details


    We only list 100% verified authentic items. We work with reputable collectors, and regularly consult with our network of scientists and experts.

    • Free Shipping

      Orders ≥$50 qualify for free US shipping
      Orders ≥$100 qualify for free global shipping

    • Secure Payments

      Pay how you like: credit card, PayPal, After Pay, Shop Pay, Venmo, Apple/Google/Meta Pay & crypto

    • Simple Returns

      Change your mind? No problem. Enjoy easy returns within 30 days.

    Customer Reviews

    Based on 4 reviews
    C.L. (Virginia, United States)

    On time arrival and as described.
    Great communication from seller who is quick to reqpond to questions.
    This thing is really cool.

    C.L. (Virginia, United States)

    As described, well packaged, good seller communication and arrived on time.
    Can't wait to show it off to friends and family.
    You should add one to your collection.

    V.F. (Virginia, United States)

    Valerie gave this item 4 stars

    A.A.S. (California, United States)

    A bit smaller than I was expecting

    similar items_


    You deserve better than craft store science products. And we think learning is more impactful when you're holding a tangible piece of what you're learning about. That's why Stemcell exists.

    We're dedicated to providing the best scientific products available—whether they're fragments of scientific importance, experimental activities, or just interesting things that scratch your curiosity itch.

    With every new product launch, our list of new ideas gets longer rather than shorter. So check in often for our latest projects, and thanks for being a part of our endeavor to make the world a smarter place to live.

    Believe in yourself; for everything else, there's science.