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Common foxglove
Habit (mature) · Robert Flogaus-Faust / Wikimedia Commons · CC BY 4.0
Limited coverage
Common foxglove
Digitalis purpurea
A tall biennial or short-lived perennial of western, southern, and central Europe, long grown in cottage gardens and at woodland edges for its dramatic one-sided spikes of pendulous, funnel-shaped flowers. The first year forms a basal rosette of soft, wrinkled leaves; the second sends up a 2-to-5-foot spike of strawberry-pink, purple, or white tubular blooms spotted purple and white inside, from May into June. Missouri Botanical Garden PlantFinder notes the flowers are attractive to hummingbirds — and that the plant is highly poisonous, its leaves being the source of the heart drug digitalis.
Review: Source-backed
Climate fit: moderate (45/100)
Border
Pollinator
Focal point
Light
Full sun / Part shade
Water
Moderate water
Mature size
24-60" tall · 18" apart
Hardy in zones
4a-8b
very cold to frosty winters
Native in Illinois
No
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Bumblebees are the principal pollinators, working up the one-sided spike of pendulous tubular flowers; the flowers favor cross-pollination but plants set seed readily and self-sow.
Cold hardiness
Future
These values are location-based: this location's current hardiness is the baseline, and the 2050 value is a projected future climate for this same location.
Now
Zone 6b
USDA
Published baseline for this location from 1991-2020.
Source: USDA Plant Hardiness Zone Map 2023 (1991-2020 climatology) via ArcGIS FeatureServer
Well-suited
2050
Zone 7a
Plotwright
Projected zone for this same location in 2050 (2041-2070) using SSP3-7.0 (regional rivalry).
Well-suited
In plain terms: This location is in Zone 6b today. Its hardiness profile is cold winters, and coldest nights are typically around -3°F. By 2050, the projected hardiness zone is Zone 7a based on SSP3-7.0 (regional rivalry). That is a +0.5-zone shift from Zone 6b to Zone 7a by 2050.
Well-suited today and still thriving in 2050.
Heat tolerance
Future
Heat tolerance values are location-based too: heat days today are observed at this site, and the 2050 value projects this same location under a future climate.
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Sources & citations
Cite this page
For lesson plans, articles, or research that uses this page. To cite a single upstream fact instead, use its specific source listed below.
Plotwright. (2026, May 17). Common foxglove (Digitalis purpurea). Retrieved 2026, June 10, from https://plotwright.garden/plants/foxglove
Sources for every fact
Every fact on this page traces to a source. 18 fields cited18 source-backed.
Missouri Botanical Garden PlantFinder
Botanical research database
Backs 17 fields
Identity
Summary
Plant type
Light
Moisture
Hardiness
Heat zone
Size
Spacing
Habit
Design roles
Seasonal interest
Growth stages
Lifecycle
Regional guidance
Success tips
Designer notes
Wikimedia Commons
Photo · CC BY 4.0
Backs 1 field
Image
Community photos
The photos above are our reviewed reference set, curated for accuracy.
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