Common immortelle (Annual everlasting) care

Light

Most houseplants will scorch where common immortelle thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Requires full sun — 6+ hours of direct sunlight daily. It is native to open, sunny grasslands and rocky slopes; shade reduces flowering significantly and encourages floppy growth. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for every 7–10 days; allow soil to dry between waterings for common immortelle, 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. Highly drought-tolerant once established. Water deeply but infrequently; allow the top 2–3 cm of soil to dry out before re-watering. Overwatering or waterlogged soil causes root rot. No supplemental irrigation needed in most temperate climates once plants are established.

Soil and pot

Common immortelle grows best in sandy, gritty, well-drained soil of moderate to low fertility. Thrives in light sandy or loamy soils with excellent drainage; pH 6.0–7.5. Rich, fertile soils produce excessive foliage at the expense of flowers. Avoid heavy clay or moisture-retentive composts. 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

Common immortelle sits happiest at around 30–55% humidity and 15–28°C (59–82°F). Suits low to moderate ambient humidity. Native to semi-arid Mediterranean climates; performs best in drier air. High humidity can increase risk of botrytis on the papery bracts. If you keep the room above 15–28°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 common immortelle sparingly. One light feed of balanced granular fertiliser at planting time is sufficient. Over-fertilising, especially with nitrogen, reduces flowering. On naturally poor or sandy soils, a single balanced liquid feed in early summer can be beneficial. 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 common immortelle in the Growli community. Each is annotated with the most common cause so you know where to start.

• Root rot in wet soils — The most common failure mode. Yellowing foliage and wilting despite moist soil indicate waterlogging. Ensure sharply draining soil and avoid irrigation in cool, overcast periods.
• Botrytis (grey mould) on dried heads — Can affect papery flower bracts in wet, humid weather. Harvest stems for drying before flowers fully open; hang upside down in a warm, well-ventilated, dark area.
• Poor germination in cold soil — Seeds require soil at least 18–20°C (65–68°F) to germinate well. Start indoors 3 weeks before last frost in peat pots, or sow direct only once soil is reliably warm.

Propagation

Sow seed directly outdoors after last frost or start indoors 3 weeks early in peat pots (resents root disturbance). Surface-sow or cover lightly; germination in 14–21 days at 18–20°C. Self-seeds modestly in warm, well-drained gardens. For dried flowers, cut stems when buds show colour but before bracts fully open and hang upside-down in a ventilated space. 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

Common immortelle is pet-safe. Xeranthemum annuum is not individually listed on the ASPCA toxic or non-toxic plant database, but no toxic compounds have been reported for this genus or the Asteraceae tribe it belongs to. Generally considered safe around pets; woolly stem hairs may cause mild skin irritation in sensitive individuals. 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.

Common immortelle deep-dive guides

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

• Common common immortelle problems & fixes
• Common immortelle watering schedule
• Common immortelle light requirements
• Best soil mix for common immortelle
• Common immortelle fertilizing guide
• When to repot common immortelle
• How to propagate common immortelle
• How to prune common immortelle
• What's eating my common immortelle?
• Common immortelle growth rate & size
• Common immortelle cold hardiness
• Common immortelle temperature & humidity
• Is common immortelle toxic to cats & dogs?
• Is common immortelle toxic to cats?
• Is common immortelle toxic to dogs?
• Getting common immortelle to bloom

Featured in these plant shortlists

Common immortelle qualifies for 9 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best pet-safe houseplants — Houseplants the ASPCA lists as non-toxic to cats and dogs — every one verified against the ASPCA toxic and non-toxic plant list.
• 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 pet-safe low-maintenance plants — Non-toxic to cats and dogs and forgiving of forgotten watering — the easiest safe choices for a busy pet household.
• Best pet-safe flowering plants — Flowering houseplants the ASPCA lists as non-toxic to cats and dogs — colour and blooms in a pet home, without the worry.
• Best pet-safe plants for bright light — Non-toxic to cats and dogs and happy in a bright, sunny spot — safe plants for your best-lit windowsill.
• 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 cat-safe plants — Houseplants the ASPCA lists as non-toxic to cats (and dogs) — safe greenery for a home with a curious cat.
• Best dog-safe plants — Houseplants the ASPCA lists as non-toxic to dogs (and cats) — safe greenery for a home with a curious dog.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Common immortelle is also known as Common immortelle, Annual everlasting, and Immortelle.

• Dusky Coral Pea care — light, water and common problems
• Happy Wanderer care — light, water and common problems
• Benary's Giant Coral zinnia care — light, water and common problems
• All 8452 plant care guides in the Growli library