Spilanthes (Toothache Plant) care

Light

Most houseplants will scorch where spilanthes thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Full sun for densest growth and heaviest flowering, though it tolerates light afternoon shade in very hot climates. Too much shade gives sparse, leggy plants with few buds. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for when the top 2 cm of soil is dry, roughly every 2-3 days in summer for spilanthes, 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. Likes consistently moist soil and wilts quickly when dry, though it perks up fast after watering. Mulch to hold moisture; avoid waterlogging in containers.

Soil and pot

Spilanthes grows best in fertile, moisture-retentive loam. Rich, humus-rich, well-drained soil, pH 6.0-7.0. Incorporate compost before planting; thin or poor soils reduce vigour and flowering. 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

Spilanthes sits happiest at around 50-70% humidity and 20-30°C (68-86°F). Enjoys warm, moderately humid conditions reflecting its tropical origins. Very dry air can stress plants and invite spider mites; ensure airflow to avoid fungal issues in damp heat. 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 spilanthes sparingly. Moderate feeder. Mix compost in at planting and give a balanced liquid feed every 3-4 weeks through the growing season to sustain continuous flowering and leaf growth. 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 spilanthes in the Growli community. Each is annotated with the most common cause so you know where to start.

• Frost sensitivity — As a tender tropical it is killed by the first frost. Grow as a summer annual, start under cover, and bring containers indoors or take cuttings before cold weather.
• Wilting when dry — The succulent foliage collapses quickly in dry soil or heat. Keep soil evenly moist, mulch, and water containers frequently in summer.
• Aphids and spider mites — Soft new growth attracts aphids, and hot dry air brings mites. Inspect tips and leaf undersides, rinse off pests, and maintain humidity.
• Sparse flowering in shade — Insufficient light yields leggy growth with few buds. Site in full sun and pinch early to encourage a bushy, free-flowering habit.

Propagation

From seed surface-sown in warmth in spring (needs light and heat to germinate), or from softwood stem cuttings, which root readily in moist compost or water. 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

Spilanthes is mildly toxic to pets. Acmella oleracea is not individually listed by the ASPCA, so pet-safe status cannot be confirmed. Its leaves and buds contain spilanthol, which causes pronounced numbing, tingling, and drooling when chewed; treat with caution, discourage pets from eating it, and verify with a vet. 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.

Spilanthes deep-dive guides

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

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

Featured in these plant shortlists

Spilanthes qualifies for 1 curated Growli shortlist — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best succulents for beginners — The easiest succulents and cacti to keep alive — selected by documented growth habit, each with the light and watering it actually wants.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

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Spilanthes is also known as Toothache Plant, Buzz Buttons, and Paracress.

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