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Hieracium olafii

Hawkweed

Family AsteraceaeGenus Hieracium

Hieracium laevigatum, a close relative: one yellow dandelion-like flower head, beaded with raindrops
FlowerPictured: Hieracium laevigatum, a relativeDanny Steven S.CC BY-SA 3.0

About the plant

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

Habit
perennialPlants of the World Online
Native range
IcelandGBIF 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; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Low Rated by us, not by the source.

Start around March 15, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 21 days to germinate.

100% germination in 7–21 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Hieracium p. 48Public domain
Show the original text
Hieracium (Asteraceae). H. olafii germ. 70L(100% in 1-3 w) and 70D-40-70D(none). After 1 y DS the light requirement largely disappeared, and the seeds germ. 70D(71% in 2nd w).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Hieracium p. 48. 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, 1996

Difficulty Low Rated by us, not by the source.

Start around March 23, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on March 22, 2026.

  1. Dry storage

    Duration: 365 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: dark

about 12 months from start to sowing. Then 14 days to germinate.

71% germination in 14 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Hieracium p. 48Public domain
Show the original text
Hieracium (Asteraceae). H. olafii germ. 70L(100% in 1-3 w) and 70D-40-70D(none). After 1 y DS the light requirement largely disappeared, and the seeds germ. 70D(71% in 2nd w).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Hieracium p. 48. 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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