Corkscrew Vallisneria on the Surface:

Corkscrew Vallisneria (Vallisneria natans) is a rooted aquatic plant with ribbon-shaped leaves that twist into a tight spiral as they grow, a form named for Lake Biwa in Japan. It spreads by runners across the substrate and stays shorter than Jungle Vallisneria, which suits mid-sized aquariums. In the Botanical Method Aquarium, it grows up through the leaf litter, and its spiral leaves provide refuge and grazing surfaces for shrimp and small fish.

Essential Details

• Care Level: Easy
• Growth Habit: Rooted, spreads via runners
• Light: Low to Medium
• CO2: Not Necessary
• Propagation: Runners
• Tint Tolerance: Low to Medium
• Habitat Location: Lake Biwa and Yodo River system, Japan
• Optimal For: Betta fish, shrimp, rasboras, rice fish, and small tetras
• Use with Caution: Rinse before introducing; may carry beneficial hitchhiking snails, snail eggs, or duckweed from the grow-out ponds
• Size Range: 6 to 14 inches tall
• Quantities: 2-count bare root plants

Corkscrew Vallisneria for Planted Aquariums & Blackwater Biotopes

Corkscrew Vallisneria absorbs most of its micro- and macronutrients through its roots, so it grows best in either a dirted aquarium or an inert sand substrate with root tabs. We plant it between the leaf litter and let the runners creep among the botanicals, where new plantlets root into the perpetual substrate. As the runners fill in, the plants form dense clumps of spiral leaves where biofilm can encrust. That biofilm becomes a grazing resource for shrimp and our fishes, what we call supplemental nutrition.

The darker the tint in your aquarium, the less light reaches your plants, and light dictates how quickly Vallisneria grows. Corkscrew Vallisneria needs only low to medium light, so it keeps growing beneath a moderate tint. We like to use root tabs in an inert sand substrate to keep micro- and macronutrients available at the roots. Aquasoils absorb tannins from the water column, so an inert substrate keeps the tint your botanicals release.

Runners extend from the base of the mother plant and root new plantlets as they creep. To keep open swimming space for bettas, rasboras, and small tetras, we thin plantlets by slowly lifting them out of the substrate, which keeps clouds of dirt out of the water column. When a leaf grows long enough to lie across the surface, we remove it at the base or trim it at the water surface. Excess plants go to the compost, and we never release aquarium plants into local waterways.

Beneath the Leaves: Vallisneria natans in the Wild

Vallisneria natans is found in lakes, ponds, rivers, and rice paddies across much of Asia. Its corkscrew variety, Vallisneria natans var. biwaensis, grows only in the shallows of Lake Biwa, Japan's largest lake, and the Yodo River system that drains it. The leaves twist into a spiral because the cells along each leaf edge grow longer than the cells along the center vein. In Japan, it is called nejiremo, which translates to twisted waterweed.

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. 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.