Marimo seaweed: everything you need to know – GreenStyle

Marimo seaweed: everything you need to know

With its funny and “fluffy” shape and the very low commitment it requires, themarimo seaweed it is considered one of the most popular “houseplants” of recent years. This particular alga, whose Japanese name literally means “alga palla”, Is essentially composed of thin stems which, together, form a sphere with a slightly spongy consistency and a velvety surface.

The color of the marimo alga can range from light / bright green to dark green, and due to the ease of cultivation it is a very popular plant, even in our country.

You have probably heard it called by other names, such as the pet ball alga, thealga of lovers or, if you prefer the English version, “Marimo moss ball”.

Whatever you want to call it, the Marimo can truly improve your home and even bring you luck! Oh yes, because according to tradition, the marimo seaweed is a good luck charm, as well as a symbol of love and feelings of friendship and affection.

In Japanwhere it was classified for the first time in the waters of Lagu Akan, is so appreciated that it has been handed down from generation to generation, and in the country the ball-algae is considered an authentic national treasure. He thinks that every year, in this area, an evocative festival is celebrated (the marimo festival) dedicated to the ball-shaped algae.

The alga of lovers, however, does not grow only in Japan. You can find these moss balls in other countries as well, such as Scotland, Australia, Iceland and Estonia.

Characteristics of the seaweed

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Until now, we have seen that marimo is a round, sponge-like seaweed with a velvety surface. We also know that it is an intertwining of stems which, under the action of the waves of the lakes, take on the characteristic spherical shape.

The size of the ball seaweed they range from 3 to 15 centimeters, and the color is green, from the lightest to the darkest.

Just the stems that form the marimo, are able to absorb high quantities of nitrites and nitrates, and then transform them into oxygen, which you can see with your eyes, in the form of bubbles that are placed on the stems.

The marimo is one particularly long-lived plant, and this only adds to its charm. In fact, it is believed that the ball algae can easily reach 100 years of life, while the older specimens can reach 200 years.

Not surprisingly, the seaweed is donated and passed down from generation to generation in Japan. If you fear that its size may become impossible to manage, do not worry, because in reality the growth of the marimo is very minimal (a few millimeters per year), so it is not a bulky plant at all.

What is Marimo used for?

Like any other plant, Marimo “serves” to enrich our home environment, but not only. When placed in an aquarium, the algae can indeed provide oxygen to fishcan reduce the spread of harmful algae and weeds, and can also make the landscape more beautiful.

In addition, it is a valid ally for aquariums where fighting fish or shrimps live, who like to hide behind it.

Beyond this use, for its natural beauty and perfection, as well as for its funny appearance, the Marimo seaweed has also become a real piece of furniture, a must for those who are passionate about natural decorations for the home. .

Marimo seaweed: meaning and legend

According to tradition, the marimo is considered a lucky charm. Going deeper, however, the meaning of the seaweed hides many other secrets.

As you will recall, the marimo was classified for the first time in Lake Akan, in Japan, and it is in this lake that the legend that made this particular ball famous takes place.

A long time ago, two young boys in love challenged their respective families, opposed to their love. In order not to have to separate, the young people decided to take their own lives by throwing themselves into the lake. Their souls, however, were transformed into these rare spheres, a symbol of inseparable love and perfection.

What does it mean to give a Marimo as a gift?

In light of the legend that accompanies it, we can easily imagine what the meaning of such a gift could be.

Give a marimo seaweed as a gift represents a gesture of love; it is no coincidence that these floating balls are often given to young couples in love.

In addition, marimo algae can be a perfect gift for children, who will learn to take care of a living being, a bit like an animal, which requires very little attention.

How to take care of the Marimo seaweed?

What marimo “eat”? And when to change the water? If you have recently bought or received a ball seaweed as a gift, you can breathe a sigh of relief: the care of this strange vegetable is in fact very simple.

Broadly speaking, you should know that the marimo needs to be housed in a container of at least half a liter (depending on the size of the sphere) or inside an aquarium.

In this regard, avoid leaving a marimo algae at the mercy of your parents Red fishes. The latter could in fact make a good feast of it, immediately damaging the poor algae.

The choice of the container

In order for marimo to grow, float and “dance” (we’ll talk about it again shortly) it is necessary that the container is transparent and clear, so that it receives the necessary sunlight.

The transparent container, however, will allow you to admire the little one dance of the marimo.

The bubbles of oxygen that are formed on the surface (due to photosynthesis), in fact, will make the algapalla float, creating slow and nice ballets.

Marimo: closed or open jar?

And speaking of the container, should the jar be closed or open? If you prefer, to avoid dropping dust or debris on the plant, and to prevent unpleasant visits from mosquitoes or other insects (which could lay their eggs), you could close the jar with an aluminum cap.


L’exposure to the sun, when it comes to algapalla, it is very important. The plant should never be exposed to direct sunlight, as it would raise the temperature too much.

Rather, indirect exposure with low to medium intensity is preferable. The temperature should not exceed 24-25 degrees, and during particularly hot summers you could store the marimo in the refrigerator.

Keep in mind that these are algae that come from cold waters, so this characteristic must be respected.

Cleaning of the marimo seaweed

The seaweed should be “cleaned” with some regularity. To do this, it will be enough for you change the water in the containerrinse the seaweed under a light jet of running water and squeeze gently.

Then, give it the classic ball shape by working it with your hands, and reposition the seaweed in the jar with clean, fresh water.

There are those who recommend pouring a small amount of sparkling water in the water of the marimo, so that the alga transforms carbon dioxide into oxygen. However, it is better not to overdo this trick, as it is still a sort of unnatural “forcing” for the vegetable.

For the marimo that lives in the aquarium, however, no special cleaning operations will be necessary, as the fish will do the bulk of the work.

How many times do I have to change the water at the marimo?

As a good plant that requires little maintenance, the seaweed won’t take you too long to clean up. It will in fact be enough change the water once every 10 days or every 2 weeks.

To get rid of the chlorine, let or stand decant tap water for about 24 hours before pouring it into the container.

How to tell if the marimo is alive?

When healthy, Marimo Moss Balls have a green color and a smooth, velvety texture.

If not cared for properly, however, the algae can change color, taking on a white, brown or even gray color.

In such cases, the alga will still be alive, but it will need some extra care. First, change the water (which should be fresh and clean) and, depending on the situation, expose the vegetable for more time to indirect natural light.

Why doesn’t marimo seaweed float?

If so, the problem may be due to the size of the seaweed. The larger ones, in fact, may not be able to rise, but this does not mean that it is not a healthy or “happy” marimo.

How to know if the marimo is dead?

The symptom that indicates that the marimo is dead must be sought in its color. A black marimowith a texture that is no longer velvety and pleasant to the touch, it may no longer be alive.

Also, the seaweed will smell bad, and may lose pieces if lifted from the container.

Marimo seaweed: price and where to buy it

You can buy marimo seaweed in shop on linesu Amazon and naturally nei shops specializing in aquariums or in nurseries.

Often these algae are sold in special jars, ready to be welcomed into your home.

Il price of the marimo it can range from 10 to over 30 euros, depending on the container and the size of the seaweed.

Source: GreenStyle by

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