Non Aquatic Plants – The Ultimate Guide To Avoiding “Fake” Aquarium

Have you ever bought a lush, vibrant green plant from a big-box pet store, tucked it neatly into your substrate, only to watch it turn into a gooey, brown mess a week later? If so, you are definitely not alone. We have all been there, and it is one of the most frustrating experiences for a beginner in the hobby.

The truth is, many stores sell non aquatic plants as if they are meant to live fully submerged in your aquarium. This can lead to crashed nitrogen cycles and disappointed hobbyists. But there is a silver lining: when used correctly, these land-dwelling plants can actually become your best allies in maintaining pristine water quality.

In this guide, I am going to help you identify which plants are “fakes” that will rot underwater and show you how to properly use terrestrial species to create a stunning, nitrate-sucking riparium. By the end of this article, you will have the confidence to choose the right greenery for your setup and avoid the common pitfalls that plague so many new keepers.

The Trap: Why non aquatic plants Are Sold as Aquarium-Ready

It sounds like a bit of a conspiracy, doesn’t it? Why would a pet store sell you a plant that is destined to die? Most of the time, it isn’t malicious. Many large-scale distributors provide plants in plastic tubes labeled “aquarium plants” because they look beautiful and can survive for a few weeks in a submerged state.

These non aquatic plants often have thicker stems and waxier leaves than true aquatic species. This “waxy” cuticle allows them to resist drying out in the air, but it also prevents them from absorbing CO2 and nutrients directly from the water when fully submerged. Eventually, the plant “suffocates” and begins to decompose.

As an experienced aquarist, I have seen many people lose entire colonies of sensitive shrimp because a rotting “fake” aquatic plant caused an ammonia spike. Understanding the difference between a plant that thrives under water and one that thrives above water is the first step to becoming a master of the craft.

The “Tube Plant” Phenomenon

You’ve likely seen them—the plastic cylinders containing perfectly manicured plants like Mondo Grass or Peacock Ferns. While these look great on the shelf, they are almost never true aquatic species. They are often bog plants or terrestrial forest floor plants that enjoy high humidity but cannot live with their leaves underwater indefinitely.

If you see a plant that looks like a miniature palm tree or a common houseplant, trust your gut. If it looks too “stiff” to be an aquatic plant, it probably is. True aquatic plants like Vallisneria or Rotala often have much softer, more flexible leaves that would collapse without the support of water.

Identification Guide: Common Species to Avoid Submerging

To save you time and money, I’ve put together a list of the most common non aquatic plants that are frequently mislabeled. If you see these in your local shop, remember: they belong on your windowsill or with their roots barely touching the water, never fully submerged.

Mondo Grass (Ophiopogon japonicus)

This is perhaps the most common offender. It looks like a beautiful, dark green tuft of lawn grass. While it is very hardy in a garden, it will slowly die over a period of 3-4 weeks if you plant it in your substrate. It is a terrestrial grass, plain and simple.

Aluminum Plant (Pilea cadierei)

With its striking silver patterns and textured leaves, it is easy to see why a hobbyist would want this in their tank. However, this is a tropical houseplant. If you submerge it, the silver patches will quickly turn grey and the stem will turn to mush, polluting your water column.

Dracaena (Lucky Bamboo and Ribbon Plants)

Lucky Bamboo is a staple in many homes, and you will often see it sold for aquariums. Here is the secret: the roots love the water, but the leaves must be in the air. If you submerge the leaves of a Dracaena species, the plant will eventually rot and die.

Peacock Fern (Selaginella)

This plant has a gorgeous, iridescent blue-green hue that looks almost alien. It is often sold in the “carpet plant” section. Don’t be fooled—it is a clubmoss that requires air to breathe. It will look great for ten days and then suddenly disintegrate into a brown cloud.

The Science of Decay: What Happens When Land Plants Stay Underwater

Why exactly do these plants die? It comes down to gas exchange. Land plants have specialized pores called stomata, usually located on the underside of their leaves, which they use to take in Carbon Dioxide and release Oxygen. These stomata are designed to work in the air.

When you submerge non aquatic plants, these pores cannot function effectively. The plant essentially enters a state of permanent “breath-holding.” Furthermore, terrestrial plants have a thick waxy cuticle designed to prevent water loss (desiccating). This same cuticle prevents the leaves from absorbing nutrients from the water, which is how true aquatic plants survive.

As the plant cells die from a lack of energy and oxygen, they begin to break down. This process of decay releases organic compounds into the water. Heterotrophic bacteria move in to consume the waste, and the byproduct of this process is Ammonia (NH3). In a small aquarium, a single rotting Dracaena can produce enough ammonia to stress or kill your fish.

Identifying the Signs of Rot

If you suspect you have an accidental land plant in your tank, look for these early warning signs. First, the leaves will lose their luster and start to look “translucent.” Next, you might notice a thin film of white fuzz (fungus/biofilm) appearing on the stem near the substrate. Finally, if you tug on a leaf and it comes away like wet paper, the plant is already too far gone and should be removed immediately.

The Riparium Solution: Using Terrestrial Plants for Biofiltration

Now, I don’t want to sound like I’m against non aquatic plants entirely. In fact, I use them in almost all of my setups! The key is how you use them. When you grow these plants with their roots in the aquarium and their leaves in the open air, they become incredible “nitrate sponges.”

This style of fish keeping is often called a “Riparium” or a “Pothos-filter.” Because these plants have access to the unlimited CO2 in the room’s air, they grow much faster than submerged plants. Fast growth means they are constantly pulling nitrates and phosphates out of your water to build new leaves and stems.

I have managed tanks where the nitrates stayed at a perfect 5-10ppm purely because of a large Pothos plant growing out of the back. This means fewer water changes for you and a more stable environment for your fish. It’s a win-win situation!

Why Emersed Growth is Superior for Water Quality

Submerged plants are often limited by the amount of CO2 dissolved in the water. Unless you are injecting pressurized CO2, your plants can only grow so fast. Terrestrial plants, however, have no such limit. They take what they need from the atmosphere and use your fish waste as fuel. This makes them one of the most effective biological filters available to the modern hobbyist.

Top 5 Land Plants That Thrive with Roots in Water

If you want to try this “best of both worlds” approach, here are five non aquatic plants that I personally recommend. These species are incredibly hardy and will thrive even if you don’t have a “green thumb.”

1. Pothos (Epipremnum aureum)

The undisputed king of the riparium. Pothos is nearly indestructible. You can take a simple cutting, stick the end in your water, and within two weeks, you will see long, white roots reaching for the substrate. It is excellent for sucking up excess nutrients and provides great cover for shy fish.

2. Peace Lily (Spathiphyllum)

Peace Lilies are stunning when they bloom. They love having “wet feet.” You can mount them at the surface of the water using a small basket. Their dense root systems provide an excellent grazing ground for shrimp and fry, who love to pick at the microorganisms that live on the roots.

3. Spider Plant (Chlorophytum comosum)

These are fun because they produce “babies” on long runners. You can take these small plantlets and secure them to the rim of your tank. They develop thick, tuberous roots that are very efficient at cleaning the water. Just make sure the leaves stay dry to prevent rot.

4. Monstera Adansonii (Swiss Cheese Plant)

For a more tropical, “jungle” look, the Swiss Cheese Plant is perfect. Its vines will eventually crawl up your walls or wrap around your light fixtures. It grows more slowly than Pothos but has a much more dramatic visual impact.

5. Tradescantia Zebrina (Inch Plant)

If you want color, this is the one. With purple and silver striped leaves, it adds a pop of vibrance to the top of your tank. It is a very fast grower and can easily be pruned if it starts to take over your living room!

Installation Techniques: Mounting Your Plants to the Aquarium Rim

So, how do you actually get these non aquatic plants to stay in place? You can’t just throw them in and hope for the best. You need to keep the foliage above the water line while ensuring the roots have constant access to the water column.

Using Suction Cup Planters

You can find small acrylic or glass cups with suction cups online. Fill these with a little bit of expanded clay pebbles (LECA) or even just some coarse gravel. Place your plant in the cup and stick it to the side of the glass so the top of the cup is just at the water’s surface. This is a clean, professional-looking way to start.

The “Egg Crate” Method

For larger setups, you can use “egg crate” (plastic light diffuser) cut to fit the back of your tank. You can weave the stems of your plants through the grid. Over time, the roots will grow down into the water, and the leaves will grow up and over the grid, completely hiding the plastic. This creates a beautiful “living wall” effect.

DIY Wire Hooks

If you are on a budget, a simple piece of plastic-coated wire can be bent into a “J” shape. Hook one end over the rim of the tank and use the other end to gently cradle the stem of the plant. This is the method I used when I first started, and it works perfectly for Pothos cuttings.

Maintenance and Safety: Pruning, Light, and Livestock Safety

While using non aquatic plants is generally easy, there are a few things you need to keep in mind to ensure your aquarium remains healthy and safe. Just like your submerged plants, these land-dwellers need a bit of attention.

Lighting Requirements

Remember that these plants are now living in your room, not just in your tank. They need light! If your aquarium light is very focused downward, the plants on the rim might not get enough light. I usually suggest placing your tank near a window with indirect sunlight or using a “clamp light” with a simple LED bulb to provide supplemental lighting for the emersed growth.

Root Management

Terrestrial plants can grow massive root systems. While this is great for filtration, the roots can eventually grow into your filter intake or crowd out your submerged plants. Don’t be afraid to trim the roots! Every few months, I take a pair of sharp, sterilized scissors and prune back about 20-30% of the root mass. This encourages the plant to grow even more vigorously.

Toxicity Concerns

Some land plants, like Pothos and Peace Lilies, contain calcium oxalate crystals. These are toxic if eaten in large quantities. In my years of experience, I have never had a fish die from nibbling on Pothos roots. Most fish find them unpalatable and leave them alone. However, if you have large, herbivorous fish like Oscars or large Goldfish that try to eat everything, you might want to protect the roots with a mesh cage.

Pro-Tip: If you are a shrimp keeper, be careful when pruning the plants while they are in the tank. The sap from some terrestrial plants can be irritating to invertebrates. I always recommend removing the plant from the tank, doing your pruning, rinsing the cut end, and then placing it back in.

FAQ Section

Can I put any houseplant in my aquarium?

No, definitely not. You should stick to “riparian” or “bog” plants that are known to handle constant water contact. Avoid succulents or cacti, as their roots will rot almost instantly in an aquarium environment.

Will these plants take nutrients away from my aquatic plants?

Yes, they are very efficient competitors. If you have a heavily planted tank with many submerged species, you may need to increase your liquid fertilization routine to ensure there is enough food for everyone. I recommend a good all-in-one fertilizer like Aquifarm’s Total Nutrition.

Do I need to use soil for these plants?

No soil is needed! In fact, you should never put potting soil directly into your aquarium water as it contains fertilizers and organics that will cause massive algae blooms. The plants will get all the nutrients they need directly from the fish waste in the water.

How long does it take for a cutting to grow roots?

For most species like Pothos or Spider Plants, you will see the first “nubs” of roots within 5-7 days, and significant root growth within 14-21 days, provided the water temperature is warm (72-80°F).

Conclusion: Success with the Right Greenery

Navigating the world of aquarium plants can be tricky, especially when stores sell non aquatic plants that aren’t meant to be fully submerged. However, now that you know how to identify these species, you can avoid the heartbreak of a rotting tank and instead harness the incredible power of emersed growth.

Whether you choose to stick with true aquatic species like Anubias and Java Fern, or you decide to branch out into the world of ripariums with Pothos and Peace Lilies, the key is understanding the needs of the plant. Don’t worry—this setup is perfect for beginners! It’s a forgiving way to learn about plant biology while keeping your fish healthier than ever.

I encourage you to try adding a simple Pothos cutting to your tank this week. Watch those roots grow and see how much clearer your water becomes. It is one of the most satisfying “hacks” in the hobby. Happy fish keeping, and remember—keep the leaves in the air and the roots in the water!