Stevia (sweetleaf) care

Light

Stevia is a sun-lover and needs the brightest spot in the home to thrive. 6 hours of direct sun. Indoors that almost always means a south or west-facing windowsill in the northern hemisphere. Plants moved abruptly from low light to direct sun will scorch — acclimate them over 7-10 days by giving a little more sun each day.

Watering

Water stevia twice-weekly watering. The actual day count varies with pot size, light level, and the season — the finger test (or, better, lifting the pot to feel its weight) is more reliable than a calendar. Empty any drainage saucer after watering so the pot is never sitting in water. Consistent moisture for tender leaves.

Soil and pot

Stevia grows best in rich free-draining loam. Compost-rich; pH 6.7-7.2. 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

Stevia sits happiest at around 40-70% (outdoor) humidity and 18-27°C (65-80°F). Outdoor humidity rarely matters. If you keep the room above 18 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 stevia sparingly. Balanced feed monthly during growth; low nitrogen for sweetest leaves. 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 stevia in the Growli community. Each is annotated with the most common cause so you know where to start.

• Frost kill — Tender; bring indoors before first frost.
• Leggy growth — Pinch tops to keep bushy.
• Pale leaves — Hungry or insufficient light.
• Bitter flavour — Wait until flowering for sweetest leaves, or pick before flowering.
• Spider mites indoors — Stippling; rinse and raise humidity.

Companion plants

Stevia pairs well with Tomato, and Basil. These are species with similar light and water needs, so you can grow them in the same bed or container without conflict.

Propagation

Stem cuttings root in water in 2-3 weeks; seed germination is poor. 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

Stevia is pet-safe. Stevia rebaudiana is not listed by the ASPCA. Considered safe in moderation. 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.

Stevia deep-dive guides

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

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

Related guides

Stevia is also known as sweetleaf, sugar leaf, and candyleaf.

• Basil care — light, water and common problems
• Herb garden care — light, water and common problems
• Mint care — light, water and common problems
• All 200 plant care guides in the Growli library