Anacharis on the Surface:

Anacharis (Elodea najas), also called narrowleaf anacharis, is a submerged stem plant native to freshwater ponds and slow-moving backwaters across Argentina, Brazil, Paraguay, Bolivia, and Uruguay. Its narrow, recurved leaves grow in whorls of five along stems that branch readily at closely spaced nodes, filling open water with fine, upright growth rather than spreading across the substrate. In the Botanical Method Aquarium, it draws nutrients directly from the water column as it grows, giving cover to open-swimming fish and shrimp while competing with algae for excess nutrients.

Essential Details

• Care Level: Easy
• Growth Habit: Fast, continuous upright stem growth
• Light: Low to High
• CO2: Not Necessary
• Propagation: Stem cuttings; fragments root readily at nodes
• Tint Tolerance: Low to High
• Habitat Location: Freshwater ponds and backwaters of Argentina, Brazil, Paraguay, Bolivia, and Uruguay
• Shipping Restrictions: Not legal to ship to California
• Optimal For: Betta fish, shrimp, and other species suited to open-water cover and nutrient export in blackwater and biotope aquariums
• Use with Caution: Rinse before introducing; may carry beneficial hitchhiking snails, snail eggs, or duckweed
• Size Range: Leaves under half an inch, arranged in whorls of five along stems that can reach several feet if left untrimmed
• Quantities: Sold as a bunch of 4-5 stems

Anacharis for Planted Aquariums & Blackwater Biotopes

Anacharis branches at closely spaced double nodes along its stem, filling open water with a column of fine, upright growth rather than spreading across the substrate. Every leaf pulls dissolved nutrients directly from the water as the plant builds new tissue, making it one of the more efficient nutrient-export plants available for a freshwater aquarium. The same photosynthesis that drives that growth releases visible oxygen bubbles under bright light, a process classrooms have used for generations to demonstrate how a submerged plant respires.

Because Anacharis draws what it needs from the water column rather than the substrate, tint level has little bearing on its growth; it holds up in an aquarium tinted dark by leaf litter and seed pods as readily as in clear water. Light is the stronger lever: Anacharis photosynthesizes well even in low light and turbid water in its native range, but dense, upright growth down the full length of the stem depends on moderate to bright light reaching every whorl. We recommend trimming top growth regularly rather than letting shaded lower leaves die back.

Propagation follows the same fragmentation that spreads Anacharis in the wild: any cut section with a node roots on its own, whether planted in the substrate or left loose near the surface. We usually let fresh cuttings float for a week before rooting them, giving new growth time to establish before it competes for light lower in the water column.

Beneath the Leaves: Elodea najas in the Wild

Elodea najas grows in the lentic ponds and backwaters of the Paraná River system across Argentina, Brazil, Paraguay, and Uruguay, rooting at about a meter of depth in water clear enough for light to reach the sediment. It shares these habitats with Cabomba, Salvinia, and Pistia, other genera familiar to the aquarium trade, forming submerged stands that structure the water column for the fish and invertebrates living among them.

The plant is dioecious, meaning individual plants are either male or female, and rarely flowers in cultivation since a stem must reach the surface to open its three white petals. Male and female plants are seldom found growing together outside their native range, so Anacharis spreads almost entirely by fragmentation rather than seed, the same double-node branching that lets a single cutting establish a new stand on its own.

Outside its native range, dense Anacharis growth can block light and lower dissolved oxygen in the water below it, and a small population was found and eradicated from a Florida pond in 2018. California regulates the species for the same reason, and we're unable to ship it there as a result.

Where a botanical contributes as it breaks down, an aquatic plant is living and contributes as it grows. So let them grow. Mother Nature leads the way.

Sustainability Note:

Please select a heat/cold pack if necessary. Check your local weather before ordering to avoid any shipment holds or cancellations. Anacharis (Elodea najas) cannot legally be shipped to California; if included in an order to that state, it will be removed before shipment. All Plants may contain snails or snail eggs. We keep them in all of our aquariums for the benefits they provide. Our blackwater aquarium plants are provided in cooperation with PNW Bettas in adherence to their Shipping and DOA Policies. Your curated selection will arrive in their packaging separate from your botanical, wood & merch orders.