Best Background Aquarium Plants: 10 Tall Species for the Back of Your Tank

Why Background Plants Matter

Background plants are the backbone of any aquascape. They create depth, hide equipment (heaters, filters, return pipes), and provide the green "wall" that makes foreground and midground plants pop. The right background plants grow tall enough to reach the waterline without overwhelming the rest of your tank.

What to Look for in a Background Plant

• Height: Should reach at least 12-20 inches depending on your tank size
• Growth pattern: Upright growth that doesn't sprawl forward
• Density: Full enough to create a curtain effect when planted in groups
• Growth rate: Moderate to fast — background plants need to fill in
• Trimming tolerance: Can be topped and replanted without dying

10 Best Background Aquarium Plants

1. Vallisneria (Jungle Val)

The ultimate background plant. Jungle Val sends up long, ribbon-like leaves that can reach 3+ feet and sway gracefully in the current. It spreads through runners and can fill the entire back of your tank within weeks. Nearly impossible to kill — it grows in low light, no CO2, and virtually any water parameters.

Max height: 36"+ | Light: Low-High | CO2: Not needed | Growth: Fast

2. Hornwort (Ceratophyllum demersum)

One of the fastest-growing aquarium plants available. Hornwort can be planted in substrate or left floating as a background curtain. It absorbs nitrates aggressively and helps keep water crystal clear. Trim regularly to prevent it from taking over.

Max height: 24"+ | Light: Low-High | CO2: Not needed | Growth: Very fast

3. Rotala Rotundifolia

A versatile stem plant that creates stunning backgrounds in high-tech tanks. Under strong light, it develops pink-red tops with green lower stems. Plant in dense groups (10+ stems) for the best visual impact. Trim and replant the tops for bushier growth.

Max height: 20"+ | Light: Medium-High | CO2: Recommended | Growth: Fast

4. Water Wisteria (Hygrophila difformis)

Beautiful lacy leaves that create a jungle-like background. Water Wisteria grows fast, adapts to most conditions, and propagates from cuttings. The leaf shape varies with light — more lacy under high light, more rounded under low light.

Max height: 20" | Light: Medium | CO2: Optional | Growth: Fast

5. Amazon Sword (Echinodorus bleheri)

A rosette plant rather than a stem plant, Amazon Swords grow large enough to dominate the background of tanks 20+ gallons. Their broad leaves create a lush, tropical look. Feed with root tabs — they're heavy root feeders.

Max height: 20" | Light: Medium | CO2: Optional | Growth: Moderate

6. Ludwigia Repens

A colorful background option — the tops turn red-orange under good light while lower leaves stay green. This dual-tone effect is beautiful when planted in dense bunches. Easy to propagate by cutting and replanting.

Max height: 20" | Light: Medium-High | CO2: Optional | Growth: Moderate

7. Cabomba Caroliniana

Feathery, fan-shaped leaves that create a soft, cloud-like background. Cabomba is a classic aquarium plant that grows fast under moderate light. It does best in slightly acidic water and benefits from CO2 in harder water.

Max height: 24" | Light: Medium-High | CO2: Helpful | Growth: Fast

8. Water Sprite (Ceratopteris thalictroides)

Versatile fern-like leaves that grow tall when planted. Water Sprite produces baby plantlets on its leaves — you'll never run out. It grows fast and makes an excellent nutrient sponge for new tanks or tanks with high bioload.

Max height: 18" | Light: Low-High | CO2: Not needed | Growth: Very fast

9. Hygrophila Corymbosa (Giant Hygro)

Large, bold leaves on sturdy stems. Giant Hygro makes a strong architectural statement in the background. It's extremely easy to grow and can handle a wide range of conditions. Under high light, the new leaves develop a slight purple tinge.

Max height: 24" | Light: Medium | CO2: Optional | Growth: Moderate-Fast

10. Pogostemon Stellatus Octopus

Narrow, wispy leaves that create an elegant, grass-like background effect. Different from the broad-leaved plants on this list — Pogostemon adds textural contrast. It grows moderately fast and does well without CO2.

Max height: 20" | Light: Medium | CO2: Optional | Growth: Moderate

Background Planting Tips

1. Plant in odd-numbered groups — 3, 5, 7, or 9 stems looks more natural than even numbers
2. Stagger heights — don't line everything up perfectly. Nature isn't symmetrical.
3. Leave 1-2" between the glass and plants — this prevents algae buildup on the back glass
4. Trim before plants reach the surface — once they hit the top, they start growing horizontally and blocking light
5. Mix species for texture — combine broad-leaved and fine-leaved plants for visual interest

Shop Background Plants

Ready to fill the back of your tank? Canton Aquatics carries all 10 species on this list — shipped fresh with a live arrival guarantee. Shop background plants →