Pontederia cordata (Pickerelweed) care

Light

Most houseplants will scorch where pontederia cordata thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Full sun for the longest, densest flowering; tolerates light shade with fewer spikes. Aim for at least six hours of direct light. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for keep in standing water year-round for pontederia cordata, 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 in 8-30 cm of water over the crown at pond margins, or in permanently saturated bog soil. It will not tolerate drying out.

Soil and pot

Pontederia cordata grows best in heavy, fertile aquatic loam or clay. Use dense aquatic compost or clay-loam in a planting basket; topdress with gravel to keep water clear. Rich mud suits its strong appetite. 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

Pontederia cordata sits happiest at around Ambient outdoor humidity and -23 to 32°C (-9 to 90°F). An outdoor aquatic indifferent to air humidity; performance depends on warm shallow water and fertile substrate, not atmosphere. If you keep the room above 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 pontederia cordata sparingly. Feed established baskets with an aquatic fertiliser tablet in spring and midsummer to sustain heavy flowering; avoid loose feed that clouds water and feeds 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 pontederia cordata in the Growli community. Each is annotated with the most common cause so you know where to start.

• Spreads aggressively — In a fertile pond it can outcompete neighbours; confine to a basket and thin the rhizomes every couple of years to keep it in bounds.
• Caterpillar and beetle leaf damage — Pickerelweed borer and assorted beetles chew holes in the heart-shaped leaves; light damage is cosmetic, but pick off heavy infestations by hand.
• Few flowers in shade — Plants in too little sun produce sparse spikes and lush leaf instead; move to a sunnier margin to restore blooming.
• Dieback if water dries — It collapses quickly if the rootzone dries; maintain standing water or saturated mud through the whole season.

Propagation

Divide the rhizomes in spring as growth resumes, replanting sections with shoots into wet aquatic soil; also self-seeds freely into bare wet mud where seedlings establish readily. 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

Pontederia cordata is mildly toxic to pets. Pontederia cordata is not individually listed by the ASPCA as toxic or non-toxic. Although all parts are documented as historically edible for humans when cooked, absence from the ASPCA list is not a clearance for pets; treat with caution and verify with a vet before assuming it is pet-safe. 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.

Pontederia cordata deep-dive guides

Every aspect of pontederia cordata care, each with its own calibrated guide:

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

Featured in these plant shortlists

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

• 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 houseplants for a cool room — Houseplants that tolerate cool conditions down to about 10°C — for an unheated spare room, hallway, porch or a home kept cool.
• 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

Pontederia cordata is also commonly called Pickerelweed or Pickerel Rush.

• 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