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Digitalis grandiflora

Yellow Foxglove · Large Yellow Foxglove

Family PlantaginaceaeGenus Digitalis

A one-sided spike of pale yellow bells, netted brown inside, above broad ribbed leaves in grass
FlowerFlorian GrossirCC BY-SA 3.0

About the plant

What it is and where it grows — not part of any germination protocol.

Habit
biennial or perennialPlants of the World Online
Habit
Biennial, Perennial, Forb/herbPLANTS Database
Flower
Pale yellowWikipedia
Native range
Albania, Altay, Austria, Baltic States, Belarus, Belgium and elsewhereGBIF Backbone Taxonomy

Toxicity is noted only where a source states it. No note here is not a finding of safety.

Sources: Plants of the World Online — Royal Botanic Gardens, Kew; PLANTS Database — USDA NRCS; Wikipedia — Wikipedia contributors; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

Worth knowing

  • Grandiflora means "large-flowered". The yellow foxglove is a long-lived perennial that holds the RHS Award of Garden Merit. In the mountains it grows on warm, bushy slopes and in clearings left by logging. Wikipedia: Digitalis grandiflora

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty High Rated by us, not by the source.

Start around December 28, 2026 for a May 3 last frost.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C Light: dark

about 3 months from start to step 2. Germination happens during step 2, in 8 days.

26% germination in 3–8 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Digitalis p. 29Public domain
Show the original text
Digitalis (Scrophulariaceae). , D. grandiflora germ. 70D(25% on 6th d) and 40-70D(26% in 3-8 d). Seeds DS 1 y were dead.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Digitalis p. 29. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

Protocol 2

DerivedN. C. Deno, 1998

Difficulty High Rated by us, not by the source.

Start around March 30, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Then 6 days to germinate.

25% germination in 6 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Digitalis p. 29Public domain
Show the original text
Digitalis (Scrophulariaceae). , D. grandiflora germ. 70D(25% on 6th d) and 40-70D(26% in 3-8 d). Seeds DS 1 y were dead.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Digitalis p. 29. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

How each step is done, in Deno’s words, and what Verified and Derived mean.

Germination trials

Readers’ own records of sowing this species, published after review. Share your trial · All trials

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