Nymphoides peltata (Yellow Floating Heart) care

Light

Nymphoides peltata needs sun on the leaves, not just bright ambient room light. Needs full sun, at least 6 hours daily, for free flowering. In shade it produces leaves but few flowers and grows weakly. A south or west-facing windowsill in the northern hemisphere is the default; anywhere else, expect the plant to stretch and pale out within a season.

Watering

Water nymphoides peltata permanently submerged; maintain stable pond level. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. A true aquatic rooted in 30-90 cm of water with leaves floating on the surface. It never dries out; only keep the pond topped up in drought so the crown stays submerged.

Soil and pot

Nymphoides peltata grows best in heavy aquatic loam in a planting basket. Plant the rhizome in dense aquatic loam or pond clay in a mesh basket topped with gravel, then sink to depth. Avoid light potting composts, which float out. 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

Nymphoides peltata sits happiest at around Ambient (aquatic) humidity and 15-28°C (59-82°F). An open-water plant, so atmospheric humidity is irrelevant; its environment is the pond itself. No misting or humidity management applies. If you keep the room above 15 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 nymphoides peltata sparingly. Usually needs none in a balanced pond; if growth is weak, push an aquatic plant fertiliser tablet into the basket once in late spring. Avoid broadcasting feed into the water, which fuels algae. 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 nymphoides peltata in the Growli community. Each is annotated with the most common cause so you know where to start.

• Invasive spread — Listed as a noxious or banned aquatic in many US states and parts of the UK. Always grow in a contained basket and never release into natural waterways.
• Surface overcrowding — Dense floating mats shade out the water and starve it of oxygen. Thin runners and remove excess leaves through summer.
• Few flowers — Sparse blooming almost always means too little sun or planting too deep. Move to full sun and within the 30-90 cm depth range.
• Aphids on flower stalks — Emergent buds attract waterlily aphids. Hose them into the water for fish to eat rather than spraying pesticides into the pond.

Propagation

Divide the rhizome in spring or detach rooted runners; each node readily forms a new plant. Seed is viable but division is faster and keeps spread controllable. 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

Nymphoides peltata is mildly toxic to pets. Nymphoides peltata is not individually listed by the ASPCA as toxic or non-toxic; treat with caution and verify with a vet before assuming it is pet-safe. As an uncertain species, prevent dogs and cats from grazing the foliage, which could cause mild gastrointestinal upset. 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.

Nymphoides peltata deep-dive guides

Every aspect of nymphoides peltata care, each with its own calibrated guide:

• Nymphoides peltata watering schedule
• Nymphoides peltata light requirements
• Best soil mix for nymphoides peltata
• Nymphoides peltata fertilizing guide
• When to repot nymphoides peltata
• How to propagate nymphoides peltata
• Nymphoides peltata growth rate & size
• Nymphoides peltata cold hardiness
• Nymphoides peltata temperature & humidity
• Is nymphoides peltata toxic to cats & dogs?
• Is nymphoides peltata toxic to cats?
• Is nymphoides peltata toxic to dogs?
• Getting nymphoides peltata to bloom

Featured in these plant shortlists

Nymphoides peltata qualifies for 4 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best drought-tolerant houseplants — Houseplants that prefer to dry out — forgiving of forgotten watering and ideal for travel or busy weeks.
• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Best houseplants for full sun — Houseplants that want direct sun — the species for a hot south or west-facing windowsill where shade-lovers scorch.
• Best fast-growing houseplants — Houseplants documented as fast or vigorous growers — quick to fill a pot, cover a pole or trail down a shelf.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Nymphoides peltata is also commonly called Yellow Floating Heart or Fringed Water Lily.

• Peace lily care — light, water and common problems
• Bird of paradise care — light, water and common problems
• Hoya care — light, water and common problems
• All 5561 plant care guides in the Growli library