Top 10 Easy Aquarium Plants That Don't Need CO2

One of the biggest misconceptions in the aquarium hobby is that you need an expensive CO2 system to grow healthy, beautiful plants. While CO2 injection certainly accelerates growth and unlocks more demanding species, there are dozens of stunning plants that thrive in low-tech setups with nothing more than decent lighting and occasional fertilization.

Here are our top 10 picks for easy aquarium plants that do not need CO2.

1. Java Fern (Microsorum pteropus)

The king of low-tech plants. Java Fern is virtually indestructible, tolerating low light, a wide pH range, and even brackish water. Attach it to driftwood or rocks — never bury the rhizome in substrate. It propagates by sprouting baby plants on mature leaves, giving you free plants over time.

Light: Low to moderate | Growth: Slow | Placement: Midground to background

2. Anubias Barteri (Anubias barteri)

Another bulletproof epiphyte with thick, dark green leaves that even plant-eating fish tend to leave alone. It grows incredibly slowly, which means minimal trimming. Attach it to hardscape and watch it gradually create a lush, jungle-like atmosphere.

Light: Low to moderate | Growth: Very slow | Placement: Foreground to midground

3. Java Moss (Taxiphyllum barbieri)

The most versatile plant in the hobby. Drape it over driftwood for an aged-forest look, attach it to mesh for a moss wall, or let it float as cover for fry and shrimp. It grows in virtually any conditions and always looks good.

Light: Low to moderate | Growth: Slow to moderate | Placement: Anywhere

4. Vallisneria (Vallisneria spiralis)

Want a dramatic background plant that grows fast without CO2? Vallisneria is your answer. Its long, ribbon-like leaves sway beautifully in the current, and it spreads via runners so quickly that you will be giving away extra plants within months.

Light: Low to moderate | Growth: Fast | Placement: Background

5. Amazon Sword (Echinodorus bleheri)

A classic centerpiece plant that can grow impressively large. Amazon Swords are heavy root feeders, so plant them in nutrient-rich substrate or add root tabs every few months. A single specimen can fill the entire background of a 60-liter tank.

Light: Moderate | Growth: Moderate | Placement: Background

6. Cryptocoryne Wendtii (Cryptocoryne wendtii)

Available in beautiful green, brown, and bronze varieties, Crypts are reliable midground plants that add texture and color contrast. They may melt when first introduced to a new tank, but the roots survive and produce fresh, adapted growth within weeks.

Light: Low to moderate | Growth: Slow to moderate | Placement: Foreground to midground

7. Bucephalandra (Bucephalandra sp.)

A relative newcomer to the hobby, Bucephalandra is an epiphytic plant from Borneo with gorgeous iridescent leaves. Attach it to rocks or driftwood and enjoy its slow but steady growth. Some varieties display blue or purple iridescence under the right lighting — stunning even without CO2.

Light: Low to moderate | Growth: Very slow | Placement: Foreground to midground

8. Ludwigia Repens (Ludwigia repens)

One of the few plants that can develop red coloration without CO2 injection. Under moderate to high light with iron supplementation, the tops of Ludwigia Repens turn a beautiful deep red. It grows at a manageable pace and is easy to propagate from cuttings.

Light: Moderate to high | Growth: Moderate | Placement: Midground to background

9. Marimo Moss Ball (Aegagropila linnaei)

Not technically a plant but a spherical colony of algae, Marimo balls are as low-maintenance as it gets. They require zero care — just roll them occasionally so all sides get light. They look charming in nano tanks and Betta setups.

Light: Low | Growth: Extremely slow | Placement: Foreground accent

10. Floating Plants (Salvinia, Frogbit, Red Root Floaters)

Floating plants are nature's cheat code for a healthy aquarium. They absorb excess nutrients directly from the water column, shade the tank below (reducing algae), and provide shelter for surface-dwelling fish. They grow explosively without any special care.

Light: Any (they are closest to the light source) | Growth: Fast to very fast | Placement: Surface

Tips for Success Without CO2

Even without injected CO2, there are ways to help your plants flourish:

• Use liquid fertilizer: An all-in-one fertilizer (like Tropica Premium Nutrition or Seachem Flourish) provides essential nutrients.
• Add root tabs: For heavy root feeders like Amazon Swords and Crypts, root tabs make a dramatic difference.
• Do not overdo the lighting: Without CO2, excessive light just fuels algae. Keep it to 7-8 hours per day at moderate intensity.
• Choose the right substrate: Nutrient-rich substrates give low-tech plants a significant head start.
• Be patient: Without CO2, plants grow slower. That is actually an advantage — less trimming and maintenance.

The Bottom Line

You do not need to spend hundreds of dollars on CO2 equipment to enjoy a beautiful planted aquarium. Start with these hardy, proven species, provide basic nutrition, and exercise patience. The results will speak for themselves.