Quick answer: Fast growers like hornwort, water sprite, pennywort, and stem plants soak up nitrates and starve out algae, which makes them great for new or problem tanks. They establish cover and stabilize water quality faster than slow plants. The tradeoff is regular trimming to keep them tidy and stop them from taking over.
Fast-Growing Aquarium Plants: Top 15 Species to Boost Growth and Balance Your Tank
Fast-growing aquarium plants are more than just visual appeal — they’re one of the best tools a hobbyist can use to fight algae, soak up excess nutrients, and stabilize an aquarium quickly. Whether you’re setting up a new tank, battling water quality swings, or simply want fast results in your aquascape, these plants offer major benefits. In this guide, we’ll explore 15 of the best fast-growing aquarium plants, how to care for them, where to place them in your scape, and how to use them to maintain balance in your aquarium ecosystem.
Watch: Top 10 Fast Growing Aquarium Plants
Why Use Fast-Growing Plants in an Aquarium?
- Algae Prevention: Fast growers absorb nitrates and outcompete algae
- Water Quality: Improve filtration by soaking up waste nutrients
- Instant Cover: Create hiding spots for shy fish and shrimp quickly
- Cycle Boosters: Help establish beneficial bacteria faster in new tanks
- Frequent Propagation: Trim and replant to fill in new areas or start new tanks
Top 15 Fast-Growing Aquarium Plants
1. Hornwort (Ceratophyllum demersum)
Hornwort is one of the fastest-growing aquarium plants available. It doesn’t root — just float it or wedge it between decorations. It grows under low to moderate light and helps oxygenate and clean the water quickly.
2. Water Sprite (Ceratopteris thalictroides)
This fern-like beauty can be floated or planted in the substrate. It grows rapidly and provides shelter for fry and shrimp. Its frilly leaves give tanks a lush look and it thrives in low to medium light.
3. Hygrophila polysperma
This is a bulletproof stem plant that will quickly take over if not trimmed. It grows tall and dense, making it perfect for background coverage. Ideal for low-tech and high-tech tanks alike.
4. Vallisneria (Vallisneria spiralis, americana)
Also called “Val,” this grass-like plant spreads through runners, filling tanks quickly. It prefers being in the background and is great for tall layouts or jungle-style scapes.
5. Amazon Frogbit (Limnobium laevigatum)
A popular floating plant with large leaves and long roots that create dramatic top-cover. Frogbit grows fast and blocks light for fish that prefer low-light environments. Trim frequently to avoid overtaking your surface.
6. Ludwigia repens
This red-stemmed plant adds beautiful contrast and grows rapidly under moderate to high light. It grows in bunches and makes a fantastic mid- or background plant. Regular trimming keeps it compact and bushy.
7. Bacopa caroliniana
With thick, round leaves and strong stems, Bacopa is easy to grow and tolerant of various conditions. It’s slower than Hygrophila but still fast by planted tank standards, especially under bright light.
8. Rotala rotundifolia
Rotala offers delicate leaves and pinkish hues in high light. It’s fast-growing when kept trimmed and makes a great midground or background option. Needs trimming to prevent it from crowding other plants.
9. Duckweed (Lemna minor)
Duckweed is one of the fastest-growing aquarium plants in the world — and that’s both good and bad. It absorbs nutrients rapidly but can block all light if not controlled. Best for small tanks or shrimp setups.
10. Java Moss (Taxiphyllum barbieri)
While slow to attach, Java moss spreads rapidly once established. Use it on driftwood, rocks, or mesh to create carpets, moss walls, or shaded cover for baby fish.
11. Limnophila sessiliflora
Often compared to Cabomba, this fast-growing stem plant grows in bushy, feathery clusters. It’s low-maintenance and flourishes with regular trimming. Great for background texture.
12. Water Wisteria (Hygrophila difformis)
Wisteria is a unique, lacy-looking plant that grows quickly in low to high light. It’s adaptable, forgiving, and thrives in most conditions — one of the best beginner plants.
13. Cabomba caroliniana
This fine-leaf stem plant grows quickly but prefers high light. It needs trimming and can be brittle to plant, but offers stunning texture for high-energy layouts.
14. Salvinia minima
A smaller floating plant that multiplies rapidly with moderate light. Less invasive than Duckweed but still efficient at nutrient absorption. Its fuzzy leaves are visually unique.
15. Pennywort (Hydrocotyle leucocephala)
This plant grows like a vine, horizontally and vertically, with round leaves that resemble mini lily pads. It’s ideal for creating surface shade and grows fast when floated or rooted.
How to Use Fast-Growing Plants Effectively
- Place floaters in tanks with high bioloads or light-sensitive fish
- Use stem plants in the background or side walls for a lush effect
- Trim regularly to encourage bushy, horizontal growth
- Mix textures — combine thin-leaf and broad-leaf species
- Use fast growers to balance out slow-growing focal plants
Fertilization and Care Tips
- Use all-in-one liquid fertilizers weekly (Easy Green, Thrive, etc.)
- Root tabs help stem plants when planted in inert substrates
- Keep light consistent (6–8 hours/day)
- CO₂ is optional but boosts color and speed for many species
- Trim dead leaves to prevent decay and ammonia spikes
Final Thoughts
Fast-growing aquarium plants are ideal for both beginner and advanced aquascapers. Whether you’re fighting algae, balancing nutrients, or just want a lush tank in a hurry, these plants are low-effort powerhouses. Mix floaters, stems, and mosses to create texture and color while keeping your water clean and fish happy.
What to Read Next
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Frequently asked questions
What are the fastest growing aquarium plants?
Hornwort, duckweed, and water sprite are among the fastest. Duckweed is the most aggressive of the floaters and can cover a surface in days. Stem plants like Hygrophila polysperma, Rotala rotundifolia, and water wisteria also pile on growth quickly, and Vallisneria spreads fast through runners. Most of these grow well without high-tech equipment.
Do fast-growing plants help with algae and nitrates?
Yes. Fast growers pull nitrates and other waste nutrients out of the water column, and that is exactly what algae needs to bloom. By taking up those nutrients first, the plants outcompete algae and starve it out. This is why a heavily planted tank with fast growers usually has far fewer algae problems than a sparse one.
Do fast growers need CO2?
Most do not. Hornwort, water sprite, water wisteria, Vallisneria, Hygrophila, and duckweed all grow fast in low-tech tanks with no injected CO2. Adding CO2 will push growth even harder, but it is optional for these species. A few like Cabomba and red-stemmed plants such as Ludwigia and Rotala look and grow better with CO2 and stronger light.
How do I control overgrowth?
Trim on a schedule rather than waiting for the tank to get choked. For stem plants, cut the tops, replant or discard the trimmings, and pull older bottom growth. For floaters like duckweed and frogbit, scoop out handfuls every week so they do not block all the light below. Vallisneria runners can be pulled by hand to keep them in their area.
Do they need a lot of light?
Most fast growers do fine under low to moderate light. Hornwort, water sprite, water wisteria, and Vallisneria all grow well without strong lighting. Red and fine-leaf plants like Ludwigia repens, Rotala rotundifolia, and Cabomba are the exception and want moderate to high light to grow fast and hold their color.
Are fast-growing plants good for a new tank?
They are one of the best things you can add to a new setup. They soak up the ammonia and nitrate spikes that come during cycling, help establish beneficial bacteria, and give shy fish and shrimp instant cover. Floating fast growers are especially useful early on because they are nearly impossible to kill and start cleaning the water right away.
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