Nuphar Japonicum - Nuphar Spp.

Nuphar japonicum, often referred to as Japanese Spatterdock, is a bold and unique aquatic plant from the genus Nuphar. It is known for its long stems and rounded to slightly elongated leaves that can grow both submerged and floating, giving it a natural, pond-like appearance in the aquarium. The leaves are typically a rich green with a slightly leathery texture, and under strong lighting, may develop subtle reddish or bronze tones.

This plant grows from a thick rhizome and can become quite large over time, sending leaves up toward the surface where they may eventually float. Because of this, it is best suited for larger aquariums where it has space to spread and develop naturally. Its vertical growth and broad leaves create shade below, which can be beneficial for fish that prefer lower light areas.

Nuphar japonicum prefers stable, nutrient-rich conditions and benefits from a deep, well-fed substrate. While it can grow without CO₂ injection, added CO₂ and strong lighting will significantly improve growth speed and leaf size. Regular trimming of surface leaves can help maintain a more compact, submerged form if desired.

Due to its size and growth habit, it is often used as a focal or background plant rather than a filler. Once established, it is relatively hardy, but it does best in mature aquariums where conditions remain consistent.

Care Information:

• Tank Size: 30 gallons and up (larger preferred)
• Lighting: Medium to high
• CO₂: Not required, but recommended for best growth
• Temperature: 72–82°F (22–28°C)
• pH: 6.0–7.5
• Placement: Background or focal plant
• Growth Rate: Moderate to fast under ideal conditions
• Care Level: Moderate
• Propagation: Rhizome division

Summary: A large, rhizome-based aquatic plant with lily-like leaves—ideal for creating a natural, shaded focal point in larger aquariums.