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Plant care

Red Indian Water Lily (Red Water Lily) care

Nymphaea rubra

Also called Red Indian Water Lily, Red Water Lily, Indian Red Water Lily.

RHS H1bUSDA 10-12Mildly toxic to petsIndoor Leaves 25–50 cm in diameter with a purplish-red sheen when young

Watering rhythm

Direct sun (at least 4-6 hours)

Permanently submerged — maintain 25–50 cm of water over the crown

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Light

Direct sun (at least 4-6 hours)

Soil

Rich, clay-heavy aquatic loam

Humidity

Ambient outdoor humidity

Temp

10°C to 35°C (thrives above 24°C)

Pet safety

Mildly toxic to pets

Mature size

Leaves 25–50 cm in diameter with a purplish-red sheen when young

Care at a glance

Light

Most houseplants will scorch where red indian water lily thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Demands at least 6–8 hours of direct sunlight per day; even though flowers open at night, strong daytime light is essential for the energy needed to produce large blooms and healthy pads. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for permanently submerged — maintain 25–50 cm of water over the crown for red indian water lily, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Plant in a wide aquatic basket in heavy loam and submerge to a depth of 25–50 cm. Water temperature must stay above 24°C (75°F) for the plant to thrive; cool pond water in spring causes the plant to remain dormant until water warms.

Soil and pot

Red Indian Water Lily grows best in rich, clay-heavy aquatic loam. A fertile clay-based aquatic compost in a large, wide basket gives the best results. Supplement with aquatic fertiliser tablets from planting; this is a nutrient-hungry tropical species. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Red Indian Water Lily sits happiest at around Ambient outdoor humidity humidity and 10°C to 35°C (thrives above 24°C) (50°F to 95°F (thrives above 75°F)). As an outdoor aquatic in its natural subtropical habitat, ambient warm humidity is the norm. No additional humidity management is required when grown in a garden pond in a suitably warm climate. If you keep the room above 10°C to 35°C (thrives above 24°C) year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed red indian water lily sparingly. Push aquatic fertiliser tablets into the basket compost every 2–3 weeks during the growing season (late spring to early autumn); a balanced aquatic formula with added phosphorus encourages root development and flowering. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on red indian water lily in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Bud and pad damage from cold water — Cold water causes buds to abort and pads to develop poorly; dark-lined pots and pond positioning in full sun help raise water temperature. In UK climates, reliable blooming requires a heated pond or heated glasshouse.
  • Water lily leaf spot (Ramularia nymphaearum) — Brown or black spots with yellow halos appear on the upper surface of pads, leading to decay. Remove and dispose of affected pads promptly; improve water circulation and avoid overcrowding.

Propagation

Divide fleshy rhizomes in late spring once water temperatures are above 24°C; each section should have one or more growing eyes. Seed can be sown in shallow warm water at 28–30°C. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Red Indian Water Lily is mildly toxic to pets. Nymphaea rubra is not individually listed by the ASPCA. Nymphaea species are distinguished from the highly nephrotoxic true lilies (Lilium, Hemerocallis), and are generally considered low-risk to pets; however rhizomes contain steroidal alkaloids that may cause gastrointestinal upset if ingested. Classified mildly-toxic as a precaution — keep pets from chewing rhizomes. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Red Indian Water Lily care — frequently asked questions

What is the common name for Nymphaea rubra?

Nymphaea rubra is most commonly called Red Indian Water Lily, but it is also known as Red Indian Water Lily, Red Water Lily, Indian Red Water Lily. The names refer to the same species, so care instructions for Red Indian Water Lily apply identically to anything sold as Red Water Lily.

How much light does red indian water lily need?

Red Indian Water Lily grows best in direct sun (at least 4-6 hours). Demands at least 6–8 hours of direct sunlight per day; even though flowers open at night, strong daytime light is essential for the energy needed to produce large blooms and healthy pads.

How often should I water red indian water lily?

Water red indian water lily permanently submerged — maintain 25–50 cm of water over the crown. Plant in a wide aquatic basket in heavy loam and submerge to a depth of 25–50 cm. Water temperature must stay above 24°C (75°F) for the plant to thrive; cool pond water in spring causes the plant to remain dormant until water warms. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is red indian water lily toxic to cats and dogs?

Red Indian Water Lily is mildly toxic to pets. Nymphaea rubra is not individually listed by the ASPCA. Nymphaea species are distinguished from the highly nephrotoxic true lilies (Lilium, Hemerocallis), and are generally considered low-risk to pets; however rhizomes contain steroidal alkaloids that may cause gastrointestinal upset if ingested. Classified mildly-toxic as a precaution — keep pets from chewing rhizomes.

What USDA hardiness zone does red indian water lily grow in?

Red Indian Water Lily is rated for USDA zone 10-12 and RHS hardiness H1b. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Red Indian Water Lily deep-dive guides

Every aspect of red indian water lily care, each with its own calibrated guide:

Featured in these plant shortlists

Red Indian Water Lily qualifies for 2 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Red Indian Water Lily is also known as Red Indian Water Lily, Red Water Lily, and Indian Red Water Lily.