Sanguisorba 'Tanna' (Tanna burnet) care

Light

Aim for at least 4-6 hours of direct sun on the leaves. Full sun to partial shade. Full sun gives the most compact, free-flowering plants; light shade is tolerated where the soil stays moist. If your only bright window faces south, that's perfect for sanguisorba 'tanna' — same window any aroid would fry on.

Watering

Watering sanguisorba 'tanna': keep soil moist but not waterlogged; water every 4-7 days in dry weather. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. Prefers reliably moist, free-draining soil and resents drought. Water in prolonged dry spells, especially in sunny, exposed positions.

Soil and pot

Sanguisorba 'Tanna' grows best in moist but well-drained, fertile loam. Average to fertile soil that holds moisture yet drains in winter is ideal. It tolerates clay if it does not become stagnant; add grit to improve drainage where needed. 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

Sanguisorba 'Tanna' sits happiest at around 40-70% humidity and -25 to 26°C (-13 to 79°F). A garden perennial unaffected by air humidity; standard outdoor conditions suit it. Not cultivated indoors. 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 sanguisorba 'tanna' sparingly. Light feeder. A spring compost mulch or single balanced feed is ample; avoid over-feeding, which can soften growth and reduce its naturally tidy habit. 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 sanguisorba 'tanna' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Drought stress — Foliage scorches and flowering shortens in dry soil; keep the root zone moist through summer.
• Powdery mildew — White mildew develops on stressed, dry plants; maintain moisture and good airflow to prevent it.
• Crown rot in wet winters — Crowns can rot in waterlogged winter soil; ensure free drainage, particularly on heavy ground.
• Congested clumps — Vigour and flowering decline as clumps age; divide every few years to refresh them.

Propagation

Propagate by division in spring or autumn; this named selection is increased vegetatively rather than from seed to keep its compact habit and flower colour. 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

Sanguisorba 'Tanna' is pet-safe. The ASPCA lists Salad Burnet (Poterium sanguisorba, family Rosaceae) as non-toxic to cats, dogs and horses; 'Tanna' is a Sanguisorba of the same genus and is regarded as non-toxic. Eating any plant in quantity may cause mild, passing stomach upset; verify with a vet if concerned. 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.

Sanguisorba 'Tanna' deep-dive guides

Every aspect of sanguisorba 'tanna' care, each with its own calibrated guide:

• Sanguisorba 'Tanna' watering schedule
• Sanguisorba 'Tanna' light requirements
• Best soil mix for sanguisorba 'tanna'
• Sanguisorba 'Tanna' fertilizing guide
• When to repot sanguisorba 'tanna'
• How to propagate sanguisorba 'tanna'
• Sanguisorba 'Tanna' growth rate & size
• Sanguisorba 'Tanna' cold hardiness
• Sanguisorba 'Tanna' temperature & humidity
• Is sanguisorba 'tanna' toxic to cats & dogs?
• Is sanguisorba 'tanna' toxic to cats?
• Is sanguisorba 'tanna' toxic to dogs?
• Getting sanguisorba 'tanna' to bloom

Featured in these plant shortlists

Sanguisorba 'Tanna' qualifies for 10 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 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.
• 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

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