Green Arrow Arum (arrow arum) care

Light

Green Arrow Arum needs sun on the leaves, not just bright ambient room light. Full sun is ideal for vigorous growth and flowering; tolerates partial shade (2–6 hours of direct sun) but becomes less floriferous. Avoid deep shade. 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 green arrow arum permanent standing water or consistently saturated soil; never allow to dry out. 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. Plant in standing water up to 20 cm (8 in) deep at the pond margin, or in boggy, permanently waterlogged soil. The rhizome must never dry out; in containers, stand in a saucer of water.

Soil and pot

Green Arrow Arum grows best in heavy, humus-rich aquatic loam or clay. Use lime-free, humus-rich loam in aquatic baskets. Avoid sandy or gritty mixes that leach nutrients into the water. Tolerates acid to neutral pH (5.5–7.0). 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

Green Arrow Arum sits happiest at around 60–100% humidity and 5–28°C (41–82°F). As a pond-margin plant it is naturally adapted to high atmospheric humidity; ambient outdoor humidity at a pond edge is sufficient — no supplemental misting needed. If you keep the room above 5–28°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 green arrow arum sparingly. Apply a slow-release aquatic tablet fertiliser into the basket in spring. Avoid over-feeding, which promotes algae growth in the pond. No feeding required in nutrient-rich natural pond mud. 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 green arrow arum in the Growli community. Each is annotated with the most common cause so you know where to start.

• Crown rot — Caused by fungal pathogens in stagnant, oxygen-depleted water. Improve water circulation and avoid planting too deeply in the mud.
• Aphid colonies on flower spathes — Greenfly can cluster on emerging spathes in spring. Blast off with a strong jet of water — avoid chemical sprays near pond water where fish or amphibians are present.
• Clump overgrowth / congestion — Every 3–4 years the rhizome mass fills the basket and flowering declines. Divide in spring before growth resumes, discarding old woody sections and replanting vigorous outer pieces.

Propagation

Divide congested clumps in early spring by lifting the basket, cutting the rhizome into sections each with at least one growing point, and repotting in fresh aquatic compost. Alternatively, sow seed in late summer in pots of wet loam kept submerged at pond-margin depth — germination takes 4–8 weeks. 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

Green Arrow Arum is toxic to pets. All parts of Peltandra virginica contain insoluble calcium oxalate raphides — the same needle-like crystals found in Philodendron and Dieffenbachia. Ingestion by pets or humans causes immediate burning pain, oral swelling, hypersalivation, and GI distress. Cooking or prolonged drying destroys the crystals. Keep away from pets and children. 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.

Green Arrow Arum deep-dive guides

Every aspect of green arrow arum care, each with its own calibrated guide:

• Green Arrow Arum watering schedule
• Green Arrow Arum light requirements
• Best soil mix for green arrow arum
• Green Arrow Arum fertilizing guide
• When to repot green arrow arum
• How to propagate green arrow arum
• Green Arrow Arum growth rate & size
• Green Arrow Arum cold hardiness
• Green Arrow Arum temperature & humidity
• Is green arrow arum toxic to cats & dogs?
• Is green arrow arum toxic to cats?
• Is green arrow arum toxic to dogs?
• Getting green arrow arum to bloom

Featured in these plant shortlists

Green Arrow Arum qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Houseplants toxic to cats & dogs — The common houseplants the ASPCA lists as toxic to cats and dogs — the ones to keep out of reach, each with its symptoms and a safe alternative.
• 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.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Green Arrow Arum is also known as arrow arum, tuckahoe, Virginia tuckahoe, and bog onion.

• Large-Flowered Beardtongue care — light, water and common problems
• Hairy Beardtongue care — light, water and common problems
• Prairie Penstemon care — light, water and common problems
• All 6887 plant care guides in the Growli library