Tiger lotus: the statement bulb plant
One bulb can fill a tank with dramatic patterned leaves — or send lily pads to the surface and shade everything below. The difference is how you trim it.
Where it comes from
Nymphaea zenkeri is native to West and Central Africa — Cameroon, Gabon, the Congo basin, and neighbouring regions — where it grows in shallow ponds, slow rivers, and seasonal wetlands. Like other water lilies, it is adapted to reach the water surface with floating leaves that capture sunlight, while the growing bulb sits in the substrate below.
In the aquarium trade it is sold almost universally as "tiger lotus" in two colour forms: red and green. The red form — sometimes sold as the red tiger lotus, and treated in older literature as Nymphaea lotus var. rubra — has deep red-purple submersed leaves with darker mottling. The green form has bright green submersed leaves with similar dark spotting. Both forms are widely available in the trade.
What to expect
Tiger lotus grows from an onion-shaped bulb that can reach the size of a golf ball in a well-established plant. From the bulb, the plant produces a succession of leaves on elongated petioles — the leaf blade is round to oval, often with wavy margins, and distinctively marked with darker spots or blotches. New leaves are produced continuously from the centre of the rosette as outer leaves age and die back.
In its natural pattern, early leaves are compact and submersed, growing close to the substrate. As the plant matures and the bulb stores more energy, it begins producing floating pads — long-stemmed leaves that reach the water surface and spread a wide blade over the surface. Left untrimmed, a single bulb can cover the surface of a 60 cm tank within weeks.
The red form's submersed leaves are the most striking: a deep burgundy-red with purple-black mottling that catches light dramatically. The green form produces similar mottled leaves in bright green and dark olive. Under good light and in warmer water, both forms show the most vivid colouration.
How to keep it
| Parameter | Value |
|---|---|
| Lighting | Medium to high — more light produces deeper colour and denser growth; tolerates medium light |
| CO2 | Not required; benefits from CO2 but grows vigorously without it |
| Temperature | 22–30°C — warmer temperatures encourage faster growth and surface pad production |
| pH | 5.5–8.0 — very tolerant |
| Hardness | Soft to hard — one of the most tolerant aquarium plants for water hardness |
| Fertiliser | Root tabs beneficial — heavy root feeder; liquid dosing supplements water-column uptake |
| Substrate | Rest the bulb on the substrate with the growing tip exposed — not fully buried; roots will anchor it within weeks |
| Growth rate | Fast once the bulb establishes — a healthy bulb can produce 2–3 new leaves per week |
| Placement | Midground, Background |
| Difficulty | Easy |
The key: trim surface pads to maintain low growth
Surface pads are not a problem to fix — they are the plant\'s natural maturation response, produced as the bulb gains energy. When the plant switches from producing compact submersed leaves to sending up surface pads, simply cut the pad stem off at the point where it leaves the rosette. Do not cut into the bulb or rosette itself. The plant will then produce another submersed leaf. With consistent trimming — once a week during active growth — tiger lotus will stay compact and dramatic rather than becoming a surface-covering nuisance.
How to plant and where it works
Place the bulb on the substrate surface — do not bury it. The bulb will sprout roots downward and leaves upward within 1–2 weeks if the water is warm enough. Burying the bulb risks rotting the upper portion before it can sprout. Press it gently into the substrate surface so it does not float away, or place a small stone beside it to anchor it in position.
Tiger lotus works best as a specimen plant — one or two bulbs rather than a dense group — given the size each plant will eventually reach. In a 60–90 cm tank, position it mid to rear where the large leaves create a dramatic visual anchor for the layout without blocking foreground plants.
In tanks with cichlids or digging fish, the bulb may be uprooted. Wedging it between rocks or securing with thread initially helps until the root system establishes firmly.
What goes wrong
Bulb not sprouting. If no growth appears after 2–3 weeks in warm water (25°C+), gently check whether the bulb is firm or soft. A soft, mushy bulb has rotted and will not recover. A firm bulb may simply need more time or slightly higher temperature. Partially burying a firm bulb encourages root development.
Surface pads taking over. Trim consistently. One trimming session does not permanently stop surface pad production; the plant will continue to attempt it whenever conditions are warm and bright. Weekly trimming during peak growth periods is normal maintenance for this plant.
Pale or washed-out colour. The red form can lose its richness in low light, low phosphate, or cool water. Raise temperature above 25°C, increase light, and ensure phosphate is detectable. The green form is less affected by these factors.
Outer leaves yellowing and dying. Normal — tiger lotus continuously replaces outer leaves with new growth from the centre. Remove dying outer leaves cleanly at the petiole base to prevent them decomposing in the tank.
More plants in this series
- Amazon sword (Echinodorus grisebachii) — the plant that started planted tanks
- Cryptocoryne wendtii — rosette, runner, survivor
- Alternanthera reineckii — red colour that actually stays red
- Anubias barteri var. nana — the indestructible epiphyte
- Vallisneria spiralis — the original background plant