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Nymphaea 'Albert Greenberg' (Albert Greenberg Tropical Waterlily) care

Nymphaea 'Albert Greenberg'

Also called Albert Greenberg Tropical Waterlily.

RHS H1cUSDA 9-11Mildly toxic to petsIndoor Spread of about 1.2-1.8 m across the surface in a warm season

Watering rhythm

Direct sun (at least 4-6 hours)

Permanently submerged in warm still water

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Light

Direct sun (at least 4-6 hours)

Soil

Heavy aquatic loam or clay pond soil

Humidity

Ambient (aquatic)

Temp

20-30°C

Pet safety

Mildly toxic to pets

Mature size

Spread of about 1.2-1.8 m across the surface in a warm season

Care at a glance

Light

Most houseplants will scorch where nymphaea 'albert greenberg' thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Needs full sun, 6 or more hours daily, for its abundant multicoloured blooms. Although unusually tolerant for a tropical, it still flowers far better in the sunniest open water than in any shade. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for permanently submerged in warm still water for nymphaea 'albert greenberg', 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. Grow with 20-45 cm of warm water above the soil surface. It tolerates slightly cooler water than many tropicals but still needs warmth, ideally above about 20°C, to bloom freely. Top up in summer heat.

Soil and pot

Nymphaea 'Albert Greenberg' grows best in heavy aquatic loam or clay pond soil. Plant in an aquatic basket of heavy loam-based aquatic compost topped with washed gravel. Avoid light or peaty composts; supply a rich, firm rooting medium for this vigorous, hungry tropical. 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

Nymphaea 'Albert Greenberg' sits happiest at around Ambient (aquatic) humidity and 20-30°C (68-86°F). Humidity is not relevant for this submerged aquatic; its mottled pads and raised flowers sit at the warm water surface, which supplies all moisture. If you keep the room above 20 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 nymphaea 'albert greenberg' sparingly. Feed generously to sustain its heavy bloom: insert aquatic fertiliser tablets into the basket every 2-4 weeks through the warm season. Reduce feeding as autumn cools and stop before lifting the tuber for frost-free winter storage. 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 nymphaea 'albert greenberg' in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Sluggish start in cool water — Even this tolerant tropical needs warmth to get going. Plant out once the pond warms in early summer rather than in cold spring water.
  • Frost-tender crown — It will not survive a freezing winter outdoors. Lift the tuber before frost and store it warm and barely moist, or overwinter the plant under glass in heated water.
  • Aphids and leaf pests — Lush mottled foliage attracts waterlily aphids and china-mark moth larvae. Hose aphids into the water for fish and pick off rolled or mined leaves promptly.
  • Fewer flowers than expected — Normally very free-flowering, so a poor show points to shade, cool water or under-feeding. Provide full sun and warmth and feed every few weeks through summer.

Propagation

Increase from the tubers it produces (and any leaf plantlets), or from seed sown in warm water. Pot tubers into aquatic loam in spring, grow on in warmth, and lower into the warmed pond once established. 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

Nymphaea 'Albert Greenberg' is mildly toxic to pets. Nymphaea is not individually listed on the ASPCA Toxic or Non-Toxic Plants database, so its status is unconfirmed; treat with caution and verify with a vet. As a true waterlily (Nymphaea) it is distinct from the cat-lethal true lilies (Lilium/Hemerocallis), but ingestion of any aquatic plant may cause stomach upset; keep pets from grazing the pond. 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.

Nymphaea 'Albert Greenberg' care — frequently asked questions

What is the common name for Nymphaea 'Albert Greenberg'?

Nymphaea 'Albert Greenberg' is most commonly called Nymphaea 'Albert Greenberg', but it is also known as Albert Greenberg Tropical Waterlily. The names refer to the same species, so care instructions for Nymphaea 'Albert Greenberg' apply identically to anything sold as Albert Greenberg Tropical Waterlily.

How much light does nymphaea 'albert greenberg' need?

Nymphaea 'Albert Greenberg' grows best in direct sun (at least 4-6 hours). Needs full sun, 6 or more hours daily, for its abundant multicoloured blooms. Although unusually tolerant for a tropical, it still flowers far better in the sunniest open water than in any shade.

How often should I water nymphaea 'albert greenberg'?

Water nymphaea 'albert greenberg' permanently submerged in warm still water. Grow with 20-45 cm of warm water above the soil surface. It tolerates slightly cooler water than many tropicals but still needs warmth, ideally above about 20°C, to bloom freely. Top up in summer heat. 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 nymphaea 'albert greenberg' toxic to cats and dogs?

Nymphaea 'Albert Greenberg' is mildly toxic to pets. Nymphaea is not individually listed on the ASPCA Toxic or Non-Toxic Plants database, so its status is unconfirmed; treat with caution and verify with a vet. As a true waterlily (Nymphaea) it is distinct from the cat-lethal true lilies (Lilium/Hemerocallis), but ingestion of any aquatic plant may cause stomach upset; keep pets from grazing the pond.

What USDA hardiness zone does nymphaea 'albert greenberg' grow in?

Nymphaea 'Albert Greenberg' is rated for USDA zone 9-11 (tender tropical; annual or overwinter frost-free in cooler zones) and RHS hardiness H1c. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Nymphaea 'Albert Greenberg' deep-dive guides

Every aspect of nymphaea 'albert greenberg' care, each with its own calibrated guide:

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Nymphaea 'Albert Greenberg' qualifies for 3 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Nymphaea 'Albert Greenberg' is also commonly called Albert Greenberg Tropical Waterlily.