Plants That Grow In Only Water – A Complete Guide To Soil-Free

Have you ever looked at a professional aquascape and felt overwhelmed by the complex layers of specialized soils and fertilizers? You are not alone; many hobbyists find the idea of messy substrates and “dirted” tanks a bit intimidating when they are first starting out.

The good news is that you don’t actually need soil to create a lush, thriving underwater garden. Plants that grow in only water offer a clean, low-maintenance, and incredibly beautiful alternative for anyone from the casual goldfish keeper to the dedicated shrimp enthusiast.

In this guide, we are going to explore the best species for soil-free setups, how to keep them healthy using only water-column nutrients, and the secret to making your aquarium look like a slice of nature without the muddy mess.

Why Choose Plants That Grow in Only Water?

Choosing plants that grow in only water is one of the smartest moves a beginner can make, but it is also a technique used by high-end aquascapers for its aesthetic versatility.

When you remove the need for soil, you gain the freedom to move your plants around whenever you like. This “modular” approach to aquascaping is perfect for those who enjoy tweaking their tank’s look or for breeders who need to keep their tanks sterile and easy to clean.

Furthermore, these plants are often hardier than their root-feeding counterparts. Since they are evolved to pull nutrients directly from the water, they are excellent at filtering your aquarium by absorbing nitrates and phosphates, which helps prevent algae blooms and keeps your fish healthy.

The Beauty of Versatility

Without soil, you can attach plants to driftwood, stones, or even 3D-printed ornaments. This adds a vertical dimension to your tank that traditional “planted” tanks often struggle to achieve.

Simplified Maintenance

Forget about “vacuuming” around delicate roots or worrying about substrate compaction. Soil-free setups are much easier to maintain, making them ideal for busy hobbyists or those keeping sensitive species like Caridina shrimp.

Top Floating Plants for Your Aquarium

Floating plants are the ultimate “plug and play” option. They require zero planting and thrive by soaking up light from above and nutrients from below. They provide excellent cover for shy fish and are the world’s best natural water purifiers.

Amazon Frogbit (Limnobium laevigatum)

Amazon Frogbit is a favorite among aquarists for its long, trailing roots that create a “jungle” look. The leaves are round and waxy, sitting elegantly on the water’s surface.

These roots provide a perfect grazing ground for baby shrimp and fry. Don’t worry—this setup is perfect for beginners! Just ensure the tops of the leaves stay dry, as constant splashing can cause them to rot.

Red Root Floaters (Phyllanthus fluitans)

If you want a splash of color, Red Root Floaters are unmatched. Under high light, the entire plant can turn a deep, ruby red.

Their roots are a vibrant crimson, providing a stunning contrast against the green of other plants. They are a bit more sensitive to surface agitation than Frogbit, so they do best in tanks with gentle flow.

Salvinia Minima (Water Spangles)

Salvinia has a unique, fuzzy texture on its leaves that actually repels water. It grows quickly and is excellent at sucking up excess nutrients.

Because it grows so fast, you will need to scoop some out occasionally to ensure light still reaches the bottom of your tank. This is a great way to physically remove nitrates from your ecosystem!

The Power of Epiphytes: Plants That Grow on Wood and Rock

Epiphytes are plants that naturally grow on surfaces like tree trunks or stones in the wild, rather than in the dirt. In the aquarium, these are the kings of plants that grow in only water because they possess a specialized stem called a rhizome.

Anubias Species: The “Indestructible” Choice

Anubias is arguably the most popular genus in the hobby. From the tiny Anubias Nana Petite to the massive Anubias Gigantea, there is a size for every tank.

The most important rule with Anubias is to never bury the rhizome in soil. If you do, the plant will suffocate and rot. Instead, wedge it into a crack in a rock or tie it to a piece of driftwood with some fishing line or cotton thread.

Java Fern (Microsorum pteropus)

Java Fern is another staple that thrives without substrate. It features long, hardy leaves that can withstand the “nibbling” of boisterous fish like goldfish or cichlids.

Like Anubias, it has a rhizome that must remain exposed to the water flow. You may notice small black spots on the underside of the leaves—don’t panic! These are spores, and eventually, tiny “baby” ferns will grow directly off the old leaves.

Bucephalandra: The Jewel of the Aquarium

Commonly known as “Buce,” these plants are the high-end choice for many hobbyists. They come in hundreds of varieties, often with iridescent leaves that shimmer with blue, purple, or metallic green hues.

They are slow growers, which means they don’t require much maintenance, but they do appreciate a consistent supply of liquid fertilizers and good water circulation.

Growing Land Plants in Your Aquarium Filter

A growing trend in the hobby is the “riparium” style, where land plants are grown with their roots submerged in the aquarium water while their foliage grows out of the top. This is one of the most effective ways to manage plants that grow in only water for maximum nitrate export.

Pothos (Epipremnum aureum)

Pothos is perhaps the most famous “aquarium hack” plant. You can take a cutting from a common houseplant, wash away any dirt, and stick the stems into your HOB (hang-on-back) filter or a suction-cup basket.

The roots will quickly grow into the water, creating a massive biological filter. Pothos is so efficient at removing nitrates that you may find you need to perform fewer water changes!

Peace Lily (Spathiphyllum)

Peace Lilies produce beautiful white blooms and have dark, glossy leaves. Like Pothos, they should not be fully submerged.

Only the roots should be in the water. They are excellent for open-top tanks and add a sophisticated, botanical look to any room. Just be sure to keep the leaves above the water line to prevent decay.

Lucky Bamboo (Dracaena sanderiana)

Contrary to its name, this isn’t actually bamboo. It is a hardy stalk plant that can live for years with its “feet” in the water.

Ensure the leaves are above the surface, and the Lucky Bamboo will happily pull nutrients from your fish waste. It’s a classic choice for small desktop tanks or Betta setups.

Essential Care: How to Provide Nutrients Without Substrate

Since these plants aren’t getting nutrients from the soil, they rely entirely on the water column. This means you, the aquarist, need to ensure the water contains the minerals they need to thrive.

Liquid Fertilizers are Your Best Friend

In a soil-free setup, an “All-in-One” liquid fertilizer is essential. Look for a product that contains both macronutrients (Nitrogen, Phosphorus, Potassium) and micronutrients (Iron, Manganese, etc.).

For most low-light setups, dosing once or twice a week after a water change is usually enough. If you see yellowing leaves (chlorosis), it’s a sign your plants that grow in only water are hungry for more nutrients.

The Role of Fish Waste

Your fish are tiny fertilizer factories! Their waste breaks down into ammonia, then nitrites, and finally nitrates.

Plants love nitrates. In a well-stocked tank, you might find that your floating plants grow so fast they don’t even need extra fertilizer. This is the beauty of a balanced ecosystem.

Lighting Requirements

Even though these plants are easy, they still need light to photosynthesize. Most of the species mentioned here (Anubias, Java Fern, Mosses) are “low-light” plants.

This means a standard LED aquarium light is usually sufficient. Aim for 6 to 8 hours of light per day. If you start seeing green algae on the leaves, try reducing the “on” time by an hour.

How to Anchor Plants Without Using Soil

One of the biggest questions beginners have is: “If I don’t bury them, how do they stay down?” Since many of these plants are buoyant or will drift around, you need a way to secure them.

Cyanoacrylate Gel (Aquarium Safe Glue)

This is the secret weapon of pro aquascapers. Standard “Super Glue Gel” (ensure the only ingredient is Cyanoacrylate) is perfectly safe for fish and shrimp once it hits the water.

Simply put a small dab on the root or rhizome and press it onto a rock or piece of wood for a few seconds. It cures almost instantly in water.

Fishing Line or Sewing Thread

If you prefer not to use glue, you can tie your plants down. Clear fishing line is invisible underwater, while black cotton thread will eventually rot away after the plant’s roots have naturally gripped the surface.

Suction Cups and Baskets

For floating plants or riparium plants like Pothos, you can use suction-cup rings to keep them in one corner of the tank. This prevents them from being pushed under by the filter outlet or blocking all the light from the plants below.

Common Challenges and Troubleshooting

Even the easiest plants can run into trouble. Here is how to handle the most common issues you might face with plants that grow in only water.

Leaf Melting

When you first bring a plant home, it may lose some leaves. This is called “melting.” Most aquarium plants are grown emersed (out of water) at the nursery.

When they are submerged in your tank, they need to shed their “air leaves” and grow “water leaves.” Be patient—don’t throw the plant away! As long as the rhizome is firm, it will bounce back.

Algae on Leaves

Because epiphytes like Anubias grow slowly, they can become a magnet for spot algae. This usually happens if the light is too bright or if there are too many nutrients in the water.

To fix this, you can move the plant to a shadier spot in the tank or introduce “cleaner” species like Nerite snails or Amano shrimp. They love grazing on the leaves of these hardy plants!

Yellowing or Holes in Leaves

If your Java Fern starts developing holes or the edges turn transparent, it’s likely a potassium deficiency. Since these plants don’t have soil to fall back on, they are the first to show signs of nutrient depletion in the water. Increase your liquid fertilizer dosage slightly to correct this.

FAQ: Frequently Asked Questions

Can I grow these plants in a bowl without a filter?

Yes, you can, but it is more challenging. Without a filter, you must be very diligent with water changes to prevent the water from becoming stagnant. Floating plants like Salvinia are best for bowls as they help oxygenate the water surface.

Do I need CO2 for these plants?

Generally, no. Most plants that grow in only water are slow-growing and can get all the carbon they need from the ambient air or the water column. While CO2 will make them grow faster and lusher, it is definitely not a requirement for success.

Are these plants safe for shrimp?

Absolutely! In fact, shrimp love these plants. Epiphytes and floating plants provide a massive surface area for “biofilm” to grow, which is the primary food source for dwarf shrimp.

How do I prune these plants?

For rhizome plants like Anubias, use a sharp pair of scissors to cut the rhizome itself. As long as each piece has a few leaves and some roots, it will grow into a brand new plant. For floating plants, simply scoop out the excess and discard them (or give them to a friend!).

Conclusion

Creating a beautiful, thriving aquarium doesn’t have to involve bags of expensive soil and complicated planting procedures. By focusing on plants that grow in only water, you can enjoy a clean, flexible, and stunning aquascape that is as easy to maintain as it is to look at.

Whether you are looking to add some trailing Pothos roots to your filter or a lush carpet of Java Fern to your driftwood, the soil-free approach is a proven path to success for any aquarist.

Don’t wait—pick up a few floating plants or an Anubias today and see how easy it is to bring a touch of green to your underwater world! Your fish (and your peace of mind) will thank you.