Digitalis purpurea


Masses of Digitalis purpurea, or common foxgloves, put on a stunning show with their tall stalks of flowers, but there are some things designers should know. Primarily for landscape architects, specifying D. purpurea should be addressed similarly to the use of annuals, as gardeners do with D. purpurea 'Foxy.' Here in California, they behave as biennials, where they will grow beautiful rosettes of foliage the first year followed by blooming the second. Afterwards, most will die, but some may live on if one is lucky. This short lifespan means the species is reliant on reseeding, which it will readily do in the right conditions.


The California Invasive Plant Council identifies common foxgloves with limited invasiveness. This means that you will see them in natural areas from California throughout the Pacific Northwest, particularly along roadsides. They have minimal impact; while they do indeed spread, D. purpurea does not pose much of a threat for native species at this time.


Where they can be harmful is in gardens and landscapes where unaware humans and animals might sample the toxic leaves. This is something to take seriously when considering their inclusions in gardens with pets, children, and/or the general public.

facts

Botanical Name: Digitalis purpurea

Digitalis: Latin, digitus for finger, but the reference might be derived from German's fingerhut (pronounced fingerhoot) for thimble. The flower's resemblance.

Purpurea: Purple

Common Name: Common foxglove

Family Name: Plantaginaceae


Origin: Southern Europe, Mediterranean


design considerations


Positioning: Foreground, middle ground, vertical spaces

Garden Themes: Perennial, woodland, bedding, naturalized, pollinator, cottage/informal, rock, cutting, coastal, courtyard, patio

Uses: Border, mass, cut flower (wear gloves), embankments, containers


identifying characteristics


Type: Herbaceous perennial (biennial/annual)

Form: Clumping, erect when in bloom

Texture: Coarse

Size: 2' tall and wide; up to 5' when in bloom (cultivars vary)


Outstanding Feature(s): Flower


Stems: Light green, pubescent

Leaf:

  • Type: Simple

  • Arrangement: Rosulate

  • Shape: Ovate, lanceolate

  • Margin: Crenate

  • Color: Light green

  • Surface: Quilted appearance, slightly tomentose

Flower: Spring to summer. Tubular flowers, raceme on tall stalks, color range white/cream, purple, pink (vary by cultivars). Showy

Fruit: Summer. Brown capsules follow flowers on stalks. May easily reseed in the right conditions.


cultural requirements, tolerances & problems


Sunset Zones: A2, A3; 1-24

USDA Zones: 4-8


Light: Sun in cooler regions to partial shade inland

WUCOLS SF Bay Area Hydro Zone: Moderate

Soil:

  • Texture: Loam, well composted

  • Moisture Retention: Even moisture

  • pH: Acidic

Tolerances: Deer, rabbit

Problems: Limited invasiveness, slugs, toxic leaves for humans and animals

  • Branch Strength: Weak

  • Insects: Japanese beetles, aphids, mealy bugs

  • Disease: Powdery mildew, leaf spot, rot


citations & attributions


Bayton, R. (2019). The Royal Horticultural Society's the Gardener's Botanical: An Encyclopedia of Latin Plant Names. London: Mitchell Beazley.


Extension Gardener. "Digitalis purpurea." North Carolina State University Extension, Raleigh. Accessed on August 8, 2021, from https://plants.ces.ncsu.edu/plants/digitalis-purpurea/.


Norris Brenzel, K. (Ed.). (2012). The New Sunset Western Garden Book. New York: Time Home Entertainment, Inc.


Plant Finder. "Digitalis purpurea." Missouri Botanical Garden, St. Louis. Accessed on August 8, 2021, from http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=c530.


Water Use Classification of Landscape Species. "WUCOLS IV Plant List." University of California, Division of Agriculture and Natural Resources, Davis. Accessed on July 27, 2021.

https://ucanr.edu/sites/WUCOLS/Download_WUCOLS_IV_List/.


Photos:

  • Detail photo purchased from Shutterstock.

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