Anacharis Care Guide: Easy Beginner Aquarium Plant Tips

If you just set up your first freshwater tank and someone told you to "throw in some anacharis," you're probably wondering what that even is. Good news: anacharis is one of the easiest, cheapest live plants a beginner can buy, and it forgives almost every rookie mistake. This guide covers exactly what it needs, how to plant it, and how to avoid killing it in the first two weeks.

Quick Answer: Anacharis (Elodea densa) is a fast-growing, beginner-friendly aquarium plant that needs only moderate light, no substrate, and no CO2 injection. It typically costs $3–$8 per bunch, grows up to 1–2 inches per week, and helps absorb excess nitrates and ammonia in freshwater tanks.

What Is Anacharis, Exactly?

Anacharis is a submerged freshwater plant sold as loose stems, not a rooted potted plant. It's often labeled Elodea or Egeria densa at pet stores, and beginners frequently confuse the names. That confusion is normal — the plant industry hasn't standardized labeling well.

The plant has thin green stems covered in small, whorled leaves that grow in clusters of three or four. It floats or roots loosely in gravel, and it never develops a true root system like a terrestrial houseplant. Native to South America, it's now found in freshwater lakes and aquariums worldwide [1].

• Scientific name: Egeria densa (commonly sold as anacharis)
• Growth rate: 1–2 inches per week under good light
• Native range: South America, now naturalized globally
• Care level: Beginner (one of the easiest plants available)

Common Myth: "Anacharis and hornwort are the same plant." Reality: They're different species entirely. Anacharis has broader, paired leaves in whorls of three to four, while hornwort has thin, forked, needle-like leaves in denser whorls.

Buying Anacharis: What to Look For

Not every bunch of anacharis at the store is healthy, so inspect it before you buy. If you're new to fishkeeping, it's tempting to grab the first bunch you see near the register. Slow down for thirty seconds first.

Healthy anacharis is bright green from tip to base, with firm stems that snap crisply when bent. Avoid bunches with mushy, brown, or slimy stems — that's rot, and it won't recover once it's in your tank. Check the water in the bag too; cloudy or foul-smelling water is a red flag.

Here's a quick checklist before purchase:

1. Color — vibrant green, not yellow or brown
2. Stem firmness — snaps cleanly, doesn't feel slimy
3. Leaf density — full whorls, not bare stretches of stem
4. Bag water clarity — clear, not cloudy or smelly

Pro Tip: If you're stretching every dollar in your setup, buy one bunch of 6–8 stems for around $4–$6 and let it multiply. Anacharis grows fast enough that a single bunch can fill a 10-gallon tank within a month.

New to freshwater tanks? Check out our complete beginner's guide to live aquarium plants for more low-cost starter options →

Anacharis Care: Light, Water, and Setup

Anacharis needs moderate to high light and stable, cool-to-moderate water temperatures to thrive. Unlike many aquarium plants, it doesn't require a nutrient-rich substrate or root system to grow. You can literally let it float.

For lighting, aim for 8–10 hours per day of moderate-intensity light. Too little light causes leggy, thin growth with wide gaps between leaves. Too much light without enough nutrients can trigger algae to grow faster than the plant itself.

A basic weighted anchor or plant clip, like Aquarium Plant Weights on Amazon, makes it easy to hold stems in gravel without them floating up. If you don't want to plant it at all, letting it drift near the surface still works — many keepers do this on purpose to shade the tank.

Pro Tip: If your tank has cooler water (a goldfish or unheated tank), anacharis is one of the few live plants that actually prefers it over tropical heat.

Anacharis Propagation: How It Multiplies

Anacharis reproduces so easily that trimming it becomes routine maintenance, not a special project. New keepers often panic when they see stems getting long and tangled. That's actually a sign of healthy growth, not a problem.

To propagate, simply cut a healthy stem section with scissors. Each cutting can be replanted or left floating, and it will root and grow independently within 1–3 weeks. This is why a single bunch can turn into a full carpet of plants over a couple of months.

• Trim stems that reach the water surface to prevent shading lower plants
• Replant cut sections in a new area of the tank, or in a second tank
• Discard yellowing or dying trimmings to keep water quality high
• Share extra cuttings with other fishkeepers — it's a common hobbyist trade

A pair of aquascaping scissors on Amazon makes trimming far easier than pinching stems by hand. Because anacharis doesn't need soil to root, propagation is essentially foolproof for a first-timer.

Anacharis vs. Other Beginner Plants

Anacharis isn't the only easy plant option, but it wins on speed and cost for most beginner tanks. If you're comparing options at the store, here's how it stacks up against two other popular beginner picks.

For most new tank owners on a budget, anacharis offers the fastest visible results for the lowest cost. Need to keep costs down on your whole setup? See our budget-friendly aquarium gear picks →

Does Anacharis Really Absorb Nitrates?

Yes — anacharis is genuinely effective at absorbing excess nitrates and ammonia from aquarium water. This is one of the biggest reasons beginners are told to add it during the first few weeks of a new tank. Fast-growing stem plants pull nutrients directly from the water column instead of substrate, which is why anacharis works so quickly.

Aquatic plants use dissolved nitrogen compounds for growth, effectively competing with algae for the same resources [2]. This is part of why heavily planted tanks tend to have fewer algae outbreaks. As of July 2026, keeper community consensus still ranks anacharis among the top three "nitrate sponge" plants for new tanks, alongside hornwort and water sprite.

It won't replace regular water changes or a working filter, though. Think of it as a supplement to your nitrogen cycle, not a substitute [3]. For more on how nutrient uptake affects overall water stability, see general guidance from the EPA on aquatic ecosystem nutrient cycling.

Pro Tip: If you're cycling a brand-new tank, add anacharis on day one. It starts absorbing ammonia and nitrite before your beneficial bacteria colony is even established.

Common Mistakes First-Time Anacharis Owners Make

Most anacharis deaths come from handling errors, not the plant being fragile. New keepers often blame "bad luck" when the real issue is a fixable setup mistake. Here are the most common ones.

1. Leaving cut ends exposed to air too long — stems dry out fast once trimmed
2. Planting too deep in substrate — buries the growth tip and causes rot
3. Keeping it in low light for weeks — leads to thin, leggy, dying stems
4. Adding it to a tank with copper-based medication — anacharis is highly copper-sensitive
5. Assuming it needs fertilizer immediately — it usually doesn't for the first month

Copper sensitivity deserves special attention if you also keep invertebrates like shrimp or snails. Many fish medications contain copper, and it can kill anacharis and shrimp in the same dose [4]. Always check labels before treating a planted tank, as noted by Cornell University's aquatic toxicology resources.