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Safety first: every part of a foxglove — leaves, flowers, seeds, sap, even the water in a vase of cut stems — contains cardiac glycosides, the compounds refined into the heart drug digoxin. Ingestion can cause vomiting, visual disturbance, and dangerous heart-rhythm changes in people and pets, so plant it away from children, dogs, cats, and grazing animals, and wear gloves. Grown with that respect, it's an easy UK-native biennial: sow or plant in part shade, get a leaf rosette in year one and 1.5m bee-magnet spires in year two, and let it self-seed.
Key facts
- HIGHLY TOXIC — the defining fact of this plant. All parts contain cardiac glycosides (digitoxin, digoxin precursors); eating even a small amount can trigger nausea, vomiting, hallucinations of yellow-tinged vision, slowed or irregular heartbeat, and in serious cases death. Toxic to humans, dogs, cats, and horses alike.
- The same poison is the medicine: William Withering's 1785 study of foxglove for 'dropsy' founded modern cardiology, and pharmaceutical digoxin is still derived from Digitalis species. Never self-medicate — the gap between dose and overdose is tiny.
- Native to the UK and western Europe, thriving on acid soils in woodland clearings, hedge banks, and heaths — a classic first coloniser of cleared or burnt ground.
- A biennial: year one is a low leaf rosette, year two the flowering spire, then it dies and self-seeds. Each plant can shed over a million dust-fine seeds.
- One of the best UK plants for long-tongued bumblebees, which crawl right inside the spotted thimbles; the spots are nectar guides.
Care requirements#
| Plant type | Outdoor biennial (occasionally short-lived perennial) |
| Growing medium | Humus-rich, moist but drained soil; happiest on slightly acid ground |
| Light needs | Part shade to dappled woodland-edge light; tolerates full sun in cool climates if soil stays moist |
| Water frequency | Keep rosettes from drying out in year one; established plants need water only in drought |
| Sowing | Surface-sow (seed needs light) in early summer for flowers the following year |
| Temperature range | Fully hardy in the UK; USDA 4-9 |
| Fertilizer | Little needed; leaf mould or compost mulch is plenty |
| Soil pH | 4.5-6.5 preferred; tolerates neutral |
| Drainage needs | Moderate — dislikes winter waterlogging |
| Spacing | 30-45cm for strong single spires |
| Handling | Wear gloves; wash hands after any contact — sap can transfer glycosides |
| Toxicity | SEVERELY toxic to humans, dogs, cats, and horses — every part, fresh or dried; keep away from children, pets, and forage |
Growth & propagation#
| Mature size | Rosette 30cm in year one; flowering spire 1.5-2m in year two |
| Growth rate | Fast for a biennial — full cycle in two seasons |
| Propagation methods | Seed only; surface-sown, self-seeds prolifically |
| Propagation difficulty | Very easy — the challenge is thinning, not germinating |
| Self-seeding | A single spire sheds hundreds of thousands of seeds; expect volunteers for years |
| Pruning needs | Cut the main spent spire to a side shoot for a second flush, or leave to seed and remove the dead plant |
Common problems & troubleshooting#
| Symptom | Likely cause | Fix |
|---|---|---|
| Pet or child has chewed any part of the plant | Cardiac glycoside poisoning risk — this is an emergency, not a gardening problem | Contact a doctor/poison centre or vet immediately, taking a sample of the plant; do not wait for symptoms (vomiting, drooling, slow or irregular heartbeat) |
| Fluffy brown pustules under leaves | Foxglove rust | Remove worst leaves, space plants for airflow; rarely fatal, plants still flower |
| Rosettes rot over winter | Waterlogged or heavy soil | Improve drainage with grit and leaf mould, or grow on a bank/slope as it does in the wild |
| Plants flowered then all died | Normal biennial life cycle, not disease | Let spires shed seed before removal, or sow fresh seed each early summer so you always have both year-one and year-two plants |
| Leaves skeletonised in spring | Slugs and snails on young rosettes (mammals, notably, leave foxglove alone) | Bait or beer-trap around rosettes in autumn and early spring |
Remember the year-two payoff
Sodate tracks your biennials so you know which rosettes are due to spire next spring — and which patch just self-seeded.
Seasonal care#
Varieties & cultivars#
| Variety | Distinguishing trait | Note |
|---|---|---|
| 'Excelsior' hybrids | Flowers held all around the stem, pastel range | The classic tall border strain |
| 'Dalmatian' series | Flowers in year one from an early sowing | Behaves like an annual |
| f. albiflora | Pure white wild form | Comes largely true from seed in isolation |
| 'Sutton's Apricot' | Soft apricot-pink spires | Cottage-garden favourite |
Buying checklist#
- Buy year-one rosettes in autumn for guaranteed flowers the next summer
- Healthy grey-green, softly hairy leaves with no rust pustules
- Label the bed — everyone in the household should know this plant is poisonous
- For wildlife value, choose the straight native purpurea over fancy hybrids
Pricing by region#
| Region | Price range | Typical unit | Basis |
|---|---|---|---|
| US | $5 – $15 | quart pot / seed packet $3-5 | Garden centre + seed catalogues |
| UK | $4 – $11 | 9cm-2L pot / seed £2-3 | Garden centre + wildflower suppliers |
| India | $1 – $4 | seed packet / seedling | Hill-station and online seed sellers (cool regions only) |
| Australia | $5 – $12 | 140mm pot / seed | Cool-climate nurseries |
| Canada | $5 – $14 | quart pot / seed | Garden centre retail |
USD figures are approximate conversions for comparison; switch the dropdown to see each region's actual local-currency listing price.
Often confused with#
Name confusion warning#
Deadly forager's error. Before flowering, foxglove is just a fuzzy leaf rosette that has been mistaken for comfrey, borage, and even plantain by foragers — with hospitalisations to show for it. If you forage leaves for tea, learn this rosette first, and never pick leafy herbs within sight of foxgloves.
Where it's actually grown#
Seed strains are produced by European flower-seed houses and wildflower specialists; potted plants are grown by ordinary bedding nurseries. Pharmaceutical digitalis leaf is farmed separately under contract (historically Digitalis lanata for digoxin) — garden plants play no role in the drug supply.
Import & biosecurity restrictions#
| Region | Note |
|---|---|
| UK | Native and unrestricted to grow; general law against uprooting any wild plant without the landowner's permission applies. |
| US | No federal restriction; naturalised (sometimes weedy) in the Pacific Northwest — deadhead to limit spread there. |
| Australia | Live plant/seed imports restricted under biosecurity law; naturalised in cool wet regions like Tasmania, where it's treated as an environmental weed — check state lists. |
| India | No restriction; viable only in cool hill regions. Digitalis was historically farmed in Himalayan stations for medicine. |
| Canada | CFIA phytosanitary rules for imports; naturalised on both coasts. |
Similar plants
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Frequently asked questions
How poisonous is foxglove really?
Seriously: every part contains cardiac glycosides that disrupt heart rhythm, and small ingested amounts can hospitalise a child or kill a pet. It's the original source of the heart drug digoxin — medicine at a controlled microdose, poison at any other.
Is it safe to touch a foxglove?
Brushing past is fine; the risk is sap and residue transferring to mouth or eyes. Wear gloves for pruning and wash your hands, and don't let children pick the 'glove' flowers.
Should I grow foxglove if I have dogs or cats?
Only where they can't chew it — poisoning is uncommon because it tastes bitter, but cases occur, including from vase water. If a pet eats any, call the vet immediately.
Why didn't my foxglove flower this year?
It's a biennial: it makes a leaf rosette in year one and flowers in year two. Sow seed two years running and it will flower every year thereafter from self-sown plants.
Are foxgloves good for bees?
Excellent — the deep thimbles are tailored to long-tongued bumblebees, and a patch in part shade flowers for weeks in early summer when queens are provisioning nests.
