How to Grow Foxglove
Digitalis purpurea
Towering cottage-garden spires loaded with spotted bells — a biennial that self-sows for effortless annual succession.
By the Plants by Zone Editorial Team · Reviewed June 1, 2026
About foxglove
Foxglove is the quintessential cottage-garden flower, building a leafy rosette in its first year then launching 3–5 ft spires of pendant, spotted bells in shades of purple, white, pink, and cream in late spring of its second year. As a biennial it dies after flowering, but it drops so many seeds that a well-sited colony becomes self-sustaining and seems to bloom every year without replanting. Foxgloves thrive at the edge of woodland shade and are a favorite larder for bumblebees, which dive completely inside each flower. All parts are toxic — the plant is the original source of the heart drug digitalis — so handle with gloves and site it away from children and pets.
When to plant and harvest foxglove
Timing is relative to your frost dates. Find your USDA zone for exact dates, or browse the month-by-month calendars.
Start seeds indoors
8–10 weeks before last frost for first-year rosettes (these plants will bloom the following year)
Transplant outdoors
2–4 weeks before last frost in spring, or in early fall for summer-sown plants; handle the developing taproot carefully
Direct sow
June–August for blooms the following spring; press seeds onto moist, firm soil surface and leave uncovered — they need light
Harvest
Late spring to early summer of year two; cut stems for bouquets when one-third of the bells on a spike are open
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How to grow foxglove step by step
- 1
Surface-sow seeds on moist seed-starting mix, pressing them lightly without covering — foxglove seeds will not germinate in the dark.
- 2
Germinate at 65–70°F; thin or pot up seedlings once they have two sets of true leaves, being careful with the taproot.
- 3
Harden off over 7–10 days, then transplant to the garden 2–4 weeks before last frost, spacing 18–24 in apart in rich, moist soil.
- 4
First-year plants form only a low leafy rosette — this is completely normal; do not remove them.
- 5
Water consistently and mulch lightly to keep the root zone cool and moist; apply compost in autumn to support the crown through winter.
- 6
In year two, allow a few spent spikes to drop seeds for succession planting; cut the rest to lateral side shoots to encourage a second flush of smaller flowers.
Common problems growing foxglove
⚠ Crown rot — plant collapses at the base
Caused by poor drainage; foxgloves need moist but never waterlogged soil — improve drainage before planting or choose a raised bed.
⚠ Powdery mildew on leaves
Improve airflow by thinning dense stands; water at the soil surface and avoid wetting foliage.
⚠ Aphids clustering on new buds or leaves
Knock off with a strong spray of water; beneficial insects typically establish control within one to two weeks without intervention.
⚠ Plant blooms weakly in year one and then dies
Seeds that experience cold after germination can rush through their biennial cycle in one season — sow seeds later (June–August) at outdoor temperatures so the plant completes its full first-year rosette before the following winter.
✓ Good companions for foxglove
✗ Keep away from
🧺 Harvesting foxglove
Cut foxglove stems when roughly one-third of the individual bells on a spike are open — florets continue to open upward in the vase over several days, giving a long display. Change the water daily and keep arrangements away from ripening fruit, which releases ethylene gas that shortens vase life. Remove spent main spikes promptly to encourage side shoots, which produce smaller but welcome secondary blooms. Always wear gloves when cutting or handling foxglove — all parts contain cardiac glycosides (digitoxin and digoxin) that are toxic to humans, dogs, cats, and horses if ingested.
Foxglove: frequently asked questions
When should you plant foxglove?＋
In most regions you start seeds indoors 8–10 weeks before last frost for first-year rosettes (these plants will bloom the following year), then transplant 2–4 weeks before last frost in spring, or in early fall for summer-sown plants; handle the developing taproot carefully — or direct sow june–August for blooms the following spring; press seeds onto moist, firm soil surface and leave uncovered — they need light. Timing is relative to your last frost, so find your USDA hardiness zone for the exact planting dates where you live.
Why didn't my foxglove bloom this year?＋
Foxglove is a biennial: it grows as a leafy rosette in year one and blooms in year two. Plants sown in spring will flower the following late spring or early summer — they are right on schedule. To have blooms every year, start a fresh batch of seeds each June through August so there is always a cohort in its second (blooming) year.
Is foxglove poisonous?＋
Yes — all parts of the plant, including leaves, seeds, flowers, and roots, contain cardiac glycosides that are toxic to humans, dogs, cats, and livestock. The plant is safe to grow and admire in the garden, but handle it with gloves, wash hands afterward, and ensure children and pets cannot chew on any part of it. Its historic medicinal use as the source of the heart drug digitalis is under strict medical supervision only.
Sources & review
Written and maintained by the Plants by Zone Editorial Team. Planting times are based on USDA hardiness zones and NOAA frost-date normals, with care guidance drawn from Cooperative Extension sources. Last reviewed June 1, 2026.
USDA Plant Hardiness Zone MapNOAA U.S. climate normalsCooperative Extension
Grow foxglove in your zone
See exactly when to plant and what else to grow alongside foxglove, tailored to your USDA hardiness zone.
