Woolly Foxglove (Grecian Foxglove) care

Light

Bright but filtered. Woolly Foxglove burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Grows best in full sun to partial shade. At least 4-6 hours of direct sun produces the most robust flowering spikes. In the first year (rosette stage), light partial shade is tolerated. In UK gardens, a south-facing border or dappled woodland edge suits it well. If you only have a south window, set the plant back 1.5 m or hang a sheer curtain — both knock the intensity down into the right range.

Watering

Watering woolly foxglove: every 7-10 days; allow the top 2-3 cm of soil to dry between waterings. 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. Average water needs — not drought-stressed but dislikes sitting in wet soil, especially in winter. Water at the base to keep foliage dry and reduce botrytis risk. Once established, it tolerates short dry spells.

Soil and pot

Woolly Foxglove grows best in well-drained loam or sandy loam, slightly acidic to neutral, ph 5.5-7.0. Prefers moderately fertile, well-drained soil enriched with organic matter. Neutral to slightly acidic pH preferred. Avoid heavy clay or waterlogged conditions, particularly over winter when the basal rosette is most vulnerable to crown rot. 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

Woolly Foxglove sits happiest at around 40-65% RH humidity and 2-25°C (36-77°F). Tolerates typical temperate outdoor humidity without issue. Ensure good airflow around rosettes to reduce powdery mildew and botrytis, particularly in humid, wet autumns. If you keep the room above 2 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 woolly foxglove sparingly. Apply a low-nitrogen, phosphorus-rich fertiliser (e.g. 5-10-5) in early spring to support root and stem development before flowering. Avoid high-nitrogen feeds which promote lush foliage but reduce flowering in the second year. 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 woolly foxglove in the Growli community. Each is annotated with the most common cause so you know where to start.

• Crown rot in wet winters — The basal rosette is susceptible to rotting in waterlogged soil over winter. Improve drainage before planting; avoid heavy mulching over the crown. In containers, ensure drainage holes are clear.
• Aphid infestations — Foxglove aphids (Aulacorthum solani) colonise flower spikes and new growth. Treat with insecticidal soap or a strong water jet; encourage hoverflies and ladybirds as natural predators.
• Powdery mildew — White powdery coating on leaves in dry, warm conditions with poor airflow. Improve spacing and ventilation; apply a potassium bicarbonate spray as a low-impact treatment.

Propagation

Primarily from seed. Surface-sow seed in early spring or summer on moist seed compost; do not cover as seed needs light to germinate. Germination occurs in 14-21 days at 15-18°C. Transplant seedlings to final positions in autumn for flowering the following summer. Plants may self-seed freely if flowerheads are left in place. 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

Woolly Foxglove is toxic to pets. All parts of Digitalis lanata are highly toxic to humans, pets (cats, dogs, horses), and livestock. Contains cardiac glycosides (especially lanatoside C, the precursor to digoxin) which cause vomiting, diarrhea, severe cardiac arrhythmias, and can be fatal even in small amounts. The ASPCA lists Digitalis (foxglove) as toxic. Wear gloves when handling; wash hands thoroughly afterward. 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.

Woolly Foxglove deep-dive guides

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

• Common woolly foxglove problems & fixes
• Woolly Foxglove watering schedule
• Woolly Foxglove light requirements
• Best soil mix for woolly foxglove
• Woolly Foxglove fertilizing guide
• When to repot woolly foxglove
• How to propagate woolly foxglove
• How to prune woolly foxglove
• What's eating my woolly foxglove?
• Woolly Foxglove growth rate & size
• Woolly Foxglove cold hardiness
• Woolly Foxglove temperature & humidity
• Is woolly foxglove toxic to cats & dogs?
• Is woolly foxglove toxic to cats?
• Is woolly foxglove toxic to dogs?
• All 8 Digitalis varieties

Related guides

Woolly Foxglove is also known as Woolly Foxglove, Grecian Foxglove, and Digitalis.

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• All 8452 plant care guides in the Growli library