Marimo Moss Ball Aquarium Kit with Ancient Paleozoic Fossil and Driftwood - Eco-Friendly Aquatic Terrarium

🌿 A Living Marimo Moss Ball, Ready for Your Desk or Shelf

Meet one of the most quietly captivating living things you can keep. The Marimo moss ball (Aegagropila linnaei) is a soft, velvety green sphere of freshwater algae that grows slowly over many years. Each kit arrives as a complete little world inside a handcrafted, cork-lid glass jar, and every Marimo comes individually named, with its own short history and a care and assembly guide. It asks for very little and gives back a calm, green presence that people genuinely grow attached to. You can read more about why these low-maintenance living pets have such a devoted following.

In the wild, Marimo form in cool, clean, slow-moving freshwater lakes, where gentle currents roll them along the lakebed and coax them into their signature round shape. They are slow growers and long-lived, which is part of why so many cultures treat them as symbols of enduring love and good fortune. Ours carry that same unhurried, deep emerald character: a smooth mossy texture, a soft rounded form, and a meditative stillness that suits a desk, a windowsill, or a bedside table. They also make a thoughtful, lasting living gift for almost any occasion.

Because Marimo thrive in cool, clean freshwater, we partner with a vetted US grower who cultivates them slowly in exactly those conditions, to the same soil-first, biological care standard that defines our own Colorado farm. Every batch is USDA-cleared and lab-tested to confirm it is free of zebra-mussel larvae and other invasive contaminants, and every kit is backed by the same 100% money-back guarantee as everything we carry.

🌱 From the Sacred Plant Co Farm. Sacred Plant Co is a soil-first farm. Our own farm in Colorado earned a groundbreaking Haney Soil Health Score of 25.4, a number that surpasses the soil biology measured in pristine forest land. That score is the heart of who we are. We believe healthier soil grows more complex, more vibrant living things, and that philosophy is the reason we hold every living thing we carry to the same biological and quality standards.

What's the difference between the Fossil kit and the Crystal kit?

The living parts are identical in both: the same hand-selected Marimo, driftwood, river stones, glass jar, and cork lid. The only difference is the centerpiece. The Fossil kit features a genuine Paleozoic seabed fossil, roughly 280 million years old, while the Crystal kit features a hand-cut crystal geode half. Choose the fossil if you love deep-time and natural history, or the crystal if you want a little more sparkle on the shelf.

How do I keep my Marimo healthy?

Marimo are wonderfully low-maintenance. We keep ours in bright, indirect light and out of direct sun, which can overheat the water and fade the deep green color. Refresh the water every one to two weeks with room-temperature spring or de-chlorinated water, and top off in between if evaporation drops the line. Every so often, give the ball a gentle roll in your palm under the fresh water to help it hold its round shape. Our full care guide walks you through it step by step.

Can I keep fish or shrimp in the jar?

This jar is sized as a calm little display for your Marimo, so it is too small for fish. It does make a lovely home for a nano shrimp or a snail or two, which graze gently alongside the Marimo. We rinse any new invertebrates before adding them so the little ecosystem stays clean and balanced.

Are your Marimo safe and legally cleared?

Yes. We work with a vetted US grower, and every batch is cleared and lab-tested to confirm it is free of zebra-mussel larvae and other invasive contaminants before it ever reaches you. It is a living decorative aquarium plant, not for eating, and like everything we carry it is backed by our 100% money-back guarantee.