Best Fast Growing Aquarium Plants – The Ultimate Guide To A Lush Tank

Every aquarist knows the feeling of staring at a brand-new setup and wishing it would just fill in already. We’ve all been there, waiting weeks for a tiny sprig of green to turn into a vibrant underwater jungle.

If you are tired of looking at bare substrate and struggling with persistent algae blooms, you are in the right place. Choosing the best fast growing aquarium plants is the single most effective way to stabilize your ecosystem and create a stunning visual display in record time.

In this guide, I’m going to share my years of experience to help you pick the right species for your specific tank. We’ll cover everything from nutrient-hungry floaters to hardy stem plants that can grow an inch a day!

Why You Need the Best Fast Growing Aquarium Plants in Your Scape

When you first start a tank, the biological balance is incredibly fragile. Ammonia spikes and excess nitrates are common, often leading to the dreaded “new tank syndrome” or a massive algae outbreak.

Fast-growing species act as the biological filters of the plant world. Because they grow so quickly, they require a massive amount of fuel, which they pull directly from your water column.

By absorbing nitrates, phosphates, and even heavy metals, these plants outcompete algae for resources. This means less cleaning for you and a much healthier environment for your fish and shrimp.

The “Nutrient Sponge” Effect

I often refer to these species as “nutrient sponges.” If you have a high bioload—perhaps a colony of messy livebearers or goldfish—these plants are your best friends.

They don’t just look pretty; they actively detoxify the environment. This creates a safety net for your livestock, ensuring that small fluctuations in water quality don’t turn into disasters.

Providing Natural Cover and Security

Beyond water quality, rapid growth provides immediate cover. Shy species like Chili Rasboras or juvenile shrimp feel much safer when they have a dense thicket of greenery to retreat into.

A stressed fish is a sick fish. By using the best fast growing aquarium plants, you are providing a natural habitat that mimics their wild environment, encouraging natural behaviors and vibrant coloration.

Top Floating Plants for Rapid Nutrient Export

Floating plants are the undisputed kings of speed. Because they have access to atmospheric CO2, they aren’t limited by the carbon levels in your water.

1. Amazon Frogbit (Limnobium laevigatum)

Amazon Frogbit is a personal favorite of mine for its beautiful, long trailing roots. These roots create a stunning “hanging garden” effect that looks incredible in open-top tanks.

It grows incredibly fast under medium to high light. Just be sure to keep the tops of the leaves dry, as constant splashing from a filter can cause them to rot.

2. Salvinia Minima (Water Spangles)

If you want something with a bit more texture, Salvinia is the way to go. The leaves are covered in tiny hairs that make them water-resistant and fuzzy to the touch.

It’s a fantastic choice for smaller nano tanks where Frogbit might look too bulky. It reproduces by dividing, and you’ll likely find yourself scooping out handfuls every single week.

3. Duckweed (Lemna minor)

We can’t talk about growth without mentioning Duckweed. Often called “aquarium herpes” because it’s so hard to get rid of, its growth rate is unmatched in the hobby.

While it is a powerhouse for removing nitrates, only add it if you are prepared to commit. It can cover the entire surface of a 20-gallon tank in just a few days if the conditions are right!

Versatile Stem Plants That Grow Like Weeds

Stem plants are the backbone of most aquascapes. They are easy to propagate; simply snip the top and replant it to double your plant mass instantly.

1. Hornwort (Ceratophyllum demersum)

Hornwort is perhaps the most resilient plant on this list. It doesn’t even have true roots! You can either weigh it down or let it float freely in the water column.

It has a needle-like leaf structure that provides excellent protection for fish fry. It’s also incredibly hardy, thriving in both cold water and tropical setups.

2. Water Wisteria (Hygrophila difformis)

Water Wisteria is a “shape-shifter.” Depending on the light and nutrients, its leaves can look like simple ovals or intricate, lacy fronds.

This is a true beginner-friendly powerhouse. It handles a wide range of water parameters and fills in midground and background spaces with a bright, lime-green hue.

3. Anacharis (Egeria densa)

If you have a “black thumb” when it comes to plants, try Anacharis. It’s a classic choice for a reason—it’s nearly indestructible.

It’s a great oxygenator and is often used in school science experiments because its growth is so visible. Just give it moderate light and watch it take over the back of your tank.

4. Guppy Grass (Najas guadalupensis)

As the name suggests, this is the ultimate plant for livebearer enthusiasts. It grows in tangled, dense mats that are perfect for hiding babies.

Guppy Grass is opportunistic. It will grow as a floating mass or anchored in the substrate, making it one of the most flexible and best fast growing aquarium plants for breeders.

The Best Root-Feeders for Background Coverage

While stem plants get most of the glory, some “rosette” style plants can also grow surprisingly fast once they are established in a nutrient-rich substrate.

1. Vallisneria (Jungle Val)

Vallisneria is the “curtain” of the aquarium world. Its long, ribbon-like leaves will grow to the surface and then drape across the top of the water.

It spreads via runners. Once it settles into your substrate, it will send out “babies” in every direction, quickly forming a dense wall of green.

2. Amazon Sword (Echinodorus grisebachii)

While it starts as a single plant, a healthy Amazon Sword can become the centerpiece of a 55-gallon tank in a matter of months.

To keep its growth rate high, you must use root tabs. These are heavy root feeders and will quickly exhaust the nutrients in plain gravel or sand.

How to Maximize Growth Rates: The “Big Three” Factors

Even the best fast growing aquarium plants will stall if they don’t have the right fuel. To get that “jungle look” quickly, you need to balance three things: light, nutrients, and carbon.

1. Lighting Requirements

You don’t need expensive “pro” lights for most fast growers, but you do need consistency. Aim for 8 to 10 hours of light per day.

If your light is too weak, stem plants will become “leggy,” with large gaps between the leaves. If it’s too strong without enough nutrients, you’ll end up with an algae farm.

2. Nutrient Supplementation

Fast growth requires a lot of food. I recommend a “low and slow” approach to liquid fertilizers.

Using an all-in-one liquid fertilizer once or twice a week provides the iron, potassium, and micronutrients these plants crave. If you see yellowing leaves, it’s usually a sign of a nutrient deficiency.

3. Carbon Dioxide (CO2)

While not strictly necessary for the plants on this list, adding pressurized CO2 is like throwing gasoline on a fire. It will triple the growth rate of almost any species.

For beginners, I usually suggest starting without CO2. Most fast growers are perfectly happy with the natural CO2 produced by your fish and surface agitation.

Maintenance and Trimming: Managing the Jungle

The downside of the best fast growing aquarium plants is that they require regular maintenance. If you don’t trim them, they will eventually block out the light for everything beneath them.

The “Cut and Replant” Method

For stem plants, don’t just trim the tops and throw them away! You can replant the cuttings directly into the substrate.

The bottom half of the original stem will soon sprout two new heads, and the new cutting will grow roots within days. This is how you turn five stems into fifty without spending an extra dime.

Managing Floating Plants

Floating plants can quickly cover 100% of the surface. This is bad for your submerged plants and can even lower the oxygen levels in the water.

I recommend using a floating airline ring to keep a “clear zone” on the surface. This allows light to reach your bottom-dwelling plants while still letting the floaters do their job.

Common Challenges and Troubleshooting

Even with the easiest plants, you might run into a few hiccups. Don’t get discouraged—it’s all part of the learning process!

The “Initial Melt”

Many plants are grown “emersed” (above water) in commercial nurseries. When you put them in your tank, they have to transition to “submersed” (underwater) growth.

It is perfectly normal for the old leaves to turn brown and fall off. As long as you see new, green growth at the tips or the base, the plant is surviving and adapting.

Dealing with “Leggy” Growth

If your plants are growing tall but look thin and sparse, they are reaching for light. This is common in deep tanks or with low-wattage fixtures.

Try increasing your light intensity or moving the plants to a shallower area of the tank. Trimming the tops frequently also encourages the plant to grow bushier rather than taller.

FAQ: Frequently Asked Questions

Which plant grows the fastest in an aquarium?

In my experience, Duckweed and Hornwort are the speed champions. Under ideal conditions, Duckweed can double its biomass in less than 48 hours!

Do fast-growing plants need CO2?

Most of the best fast growing aquarium plants, like Anacharis and Wisteria, do not require CO2. They are excellent at utilizing the CO2 naturally available in the water.

Can I put fast-growing plants in a low-light tank?

Yes! Species like Hornwort and Guppy Grass are very tolerant of low light. They won’t grow as quickly as they would under high light, but they will still outpace most other species.

Will these plants take over my tank?

They certainly can! The key is regular pruning. Think of it like a garden; a little bit of weeding and trimming every week keeps the “jungle” looking like an “aquascape.”

Are these plants safe for shrimp?

Absolutely. In fact, shrimp love them. Fast-growing plants provide a massive surface area for biofilm to grow, which is the primary food source for ornamental shrimp.

Conclusion: Start Your Green Journey Today

Creating a lush, thriving aquarium doesn’t have to take years of patience. By selecting the best fast growing aquarium plants, you are taking a shortcut to a beautiful and biologically stable tank.

Whether you choose the trailing beauty of Amazon Frogbit or the hardy thickets of Water Wisteria, these plants will work tirelessly to keep your water clean and your fish happy.

Remember, the “secret” to a great planted tank isn’t expensive gear—it’s understanding the needs of your plants and giving them the environment they need to flourish.

So, head down to your local fish store, grab a few stems, and get planting! You’ll be amazed at how quickly your underwater world transforms. Happy fishkeeping!