Water Sprite on the Surface:

Water Sprite (Ceratopteris thalictroides) is a fast-growing aquatic fern native to swampy forests, marshes, and slow-moving rivers across tropical and subtropical Asia, Africa, and the Americas. Its finely divided, lace-like fronds take on a different shape depending on whether they grow submerged or above the waterline, and the plant thrives equally well rooted in the substrate or left to drift as a floating mass. In the Botanical Method Aquarium, this flexibility makes it one of the more adaptable plants for absorbing excess nutrients and building cover for fry and shrimp.

Essential Details

• Care Level: Easy
• Growth Habit: Fast, grows equally well rooted or floating
• Light: Low to Medium
• CO2: Not Necessary
• Propagation: Adventitious plantlets on mature fronds, or floating stem cuttings
• Tint Tolerance: High
• Habitat Location: Tropical and subtropical Asia, Africa, and the Americas
• Shipping Restrictions: Not legal to ship to California
• Optimal For: Betta fish, shrimp, and fry, particularly aquariums where nutrient export and floating or midground cover matter
• Use with Caution: Rinse before introducing; may carry beneficial hitchhiking snails, snail eggs, or duckweed from the grow-out ponds
• Size Range: Fronds typically reach 8 to 20 inches at maturity, larger when grown emersed
• Quantities: Sold as bare root or potted

Water Sprite for Planted Aquariums & Blackwater Biotopes

Water Sprite's dense, feathery fronds can quickly absorb excess dissolved nutrients directly from the water column, helping to outcompete algae. That same tangle of foliage, whether rooted in the substrate or left floating at the surface, becomes a grazing ground and refuge that fry and shrimp utilize as refuge and for foraging biofilm growing on the leaf surfaces.

Water Sprite grows quite fast, filling in open water column space within weeks under good light, so we regularly thin and redistribute cuttings rather than letting a single mass shade out neighboring plants or cryptocorynes growing up from the leaf litter on the substrate. Because of its quick growth rate, California's Department of Food and Agriculture rates Ceratopteris thalictroides a noxious weed, and it cannot legally be shipped there; if included in an order to that state, it will be removed before shipment. Please remember to never release aquarium plants, Water Sprite included, into local ponds, ditches, or waterways.

Tint reduces how much light penetrates the water column, but that has little bearing on Water Sprite: floating fronds sit at the surface in full light regardless of how dark the water below has become, and even rooted specimens hold up in a heavily tinted blackwater aquarium about as well as they do in clear water. Light is the lever that actually drives its growth: more of it produces a faster, denser plant, while low light produces a sparser one that thins out. We position it nearer the surface, or increase the light intensity on our plant lights, whenever fronds start to thin.

Water Sprite propagates readily from small plantlets that form directly on its older, mature fronds, complete with their own tiny root systems while still attached to the parent leaf. Slight browning on these fronds is a normal sign of a fertile leaf carrying developing plantlets, not decline, so we leave them attached until the plantlets have grown large enough to separate and replant. A floating stem cutting will also root on its own from the surface, given enough time.

Beneath the Leaves: Ceratopteris thalictroides in the Wild

Ceratopteris thalictroides grows across a wider range than almost any other aquarium fern, rooting in flooded rice paddies, marshes, and the slow-moving margins of rivers throughout tropical Asia, Africa, and the Americas. Its fronds present two growth patterns depending on where they grow: finely divided and delicate underwater, broader and more solid once they reach open air,

Across parts of tropical Asia, young, uncurled Water Sprite fronds are gathered from rice fields and swamps and cooked or blanched as a leafy green, sometimes grown on a garden scale for that purpose alone. In the Philippines, where it's known as pakong-sungay, it remains one of several native ferns still harvested this way today. 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. Ceratopteris thalictroides 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.