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Plant care

Purple-Top Germander (Caucasian germander) care

Teucrium hircanicum

Also called Purple-top germander, Caucasian germander, Iranian germander.

RHS H6USDA 5-9Mildly toxic to petsIndoor 60–90 cm tall and 45–60 cm wide.

Watering rhythm

Bright indirect light (just back from a sunny window)

Weekly to fortnightly in summer; reduce in autumn and winter

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Light

Bright indirect light (just back from a sunny window)

Soil

Well-drained, moderately fertile, neutral to alkaline

Humidity

Moderate (40–65% RH)

Temp

-15 to 30°C

Pet safety

Mildly toxic to pets

Mature size

60–90 cm tall and 45–60 cm wide.

Care at a glance

Light

Purple-Top Germander is what florists mean by "bright spot, no direct sun" — close enough to a south or east window to feel the brightness, with a sheer curtain or a few feet of distance keeping the sun off the leaves. Flowers best in full sun but tolerates partial shade better than most germanders; in shaded sites growth is more lax and flower spikes slightly shorter, though still ornamental. A phone lux-meter at the leaf surface should read 1,500-3,000 lux at noon.

Watering

Water purple-top germander weekly to fortnightly in summer; reduce in autumn and winter. 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. More moisture-tolerant than its Mediterranean relatives but still resents waterlogging; water regularly during the growing season but allow the soil to partially dry between waterings.

Soil and pot

Purple-Top Germander grows best in well-drained, moderately fertile, neutral to alkaline. Grows in a wider range of soils than most Teucrium species, including loam and chalk soils; avoid heavy, poorly drained clay, which causes crown rot over winter. 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

Purple-Top Germander sits happiest at around Moderate (40–65% RH) humidity and -15 to 30°C (5 to 86°F). Adapted to the more humid conditions of the Hyrcanian forests and Caucasus foothills; tolerates British and US East Coast humidity better than true Mediterranean species. 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 purple-top germander sparingly. Apply a balanced granular fertiliser in spring as growth resumes; an autumn mulch of garden compost improves cold hardiness and feeds the plant as it breaks down. 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 purple-top germander in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Self-seeding invasiveness — In favourable conditions Teucrium hircanicum self-seeds freely and can become a nuisance; deadhead the spent flower spikes promptly after flowering to limit unwanted spread.
  • Powdery mildew in dry summers — White powdery fungal coating appears on leaves during dry, hot summers, particularly if plants are drought-stressed; water at the base, improve air circulation, and remove affected foliage promptly.

Propagation

Divide established clumps in spring or autumn; semi-ripe basal cuttings taken in early summer root well in gritty compost. Seed sown fresh in autumn or stratified and sown in spring germinates 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

Purple-Top Germander is mildly toxic to pets. Teucrium hircanicum is not listed on the ASPCA Toxic and Non-Toxic Plant database. It belongs to the Teucrium genus, members of which contain neo-clerodane diterpenoids associated with hepatotoxicity in humans following prolonged ingestion of herbal preparations. Ingestion by cats or dogs may cause gastrointestinal upset or, in quantity, potential liver irritation. Classified as mildly toxic as a precaution; keep away from pets and consult a vet if ingestion is suspected. 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.

Purple-Top Germander care — frequently asked questions

What is the common name for Teucrium hircanicum?

Teucrium hircanicum is most commonly called Purple-Top Germander, but it is also known as Purple-top germander, Caucasian germander, Iranian germander. The names refer to the same species, so care instructions for Purple-Top Germander apply identically to anything sold as Caucasian germander.

How much light does purple-top germander need?

Purple-Top Germander grows best in bright indirect light (just back from a sunny window). Flowers best in full sun but tolerates partial shade better than most germanders; in shaded sites growth is more lax and flower spikes slightly shorter, though still ornamental.

How often should I water purple-top germander?

Water purple-top germander weekly to fortnightly in summer; reduce in autumn and winter. More moisture-tolerant than its Mediterranean relatives but still resents waterlogging; water regularly during the growing season but allow the soil to partially dry between waterings. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is purple-top germander toxic to cats and dogs?

Purple-Top Germander is mildly toxic to pets. Teucrium hircanicum is not listed on the ASPCA Toxic and Non-Toxic Plant database. It belongs to the Teucrium genus, members of which contain neo-clerodane diterpenoids associated with hepatotoxicity in humans following prolonged ingestion of herbal preparations. Ingestion by cats or dogs may cause gastrointestinal upset or, in quantity, potential liver irritation. Classified as mildly toxic as a precaution; keep away from pets and consult a vet if ingestion is suspected.

What USDA hardiness zone does purple-top germander grow in?

Purple-Top Germander is rated for USDA zone 5-9 and RHS hardiness H6. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Purple-Top Germander deep-dive guides

Every aspect of purple-top germander care, each with its own calibrated guide:

Featured in these plant shortlists

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

Related guides

Purple-Top Germander is also known as Purple-top germander, Caucasian germander, and Iranian germander.