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Draba compacta

Crag Whitlow Grass

Family BrassicaceaeGenus Draba

Small clusters of yellow four-petalled flowers on slender stems from a low tuft beside pale rock
FlowerPictured: Draba lasiocarpa, a relativeMirko UbovićCC0

About the plant

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

Habit
subshrubPlants of the World Online
Flower
YellowRead from the photograph on this page
Native range
Albania, Bulgaria, NW. Balkan Pen., RomaniaGBIF 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; Read from the photograph on this page — Deno's Garden; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

This source reports 4 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Low Rated by us, not by the source.

Start around September 17, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 16, 2026.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Temperature: 40°F 4°C

about 6 months from start to step 2. Germination happens during step 2, in 21 days.

100% germination in 21 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Draba p. 135Public domain
Show the original text
Draba (Brassicaceae). Most Draba are D-70 germinators. A comparison of the high germination of DS to low germination of fresh seed was given in Table 5-1. Sowing of fresh seed at 70 not only gives low germination, but is often fatal. D. compacta germ. best with seed DS 6 m at 70 in either 70(96% in 5-9 d) or 40(100% in less than 3 w). Fresh seed was curious in that germination was extended at 70 but not at 40 as shown by 40(80% in 3-7w) and 70(1%)-40(54% in 1-3 w)- 70(1%).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Draba p. 135. 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, 1993

Difficulty Low Rated by us, not by the source.

Start around September 29, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 28, 2026.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C

about 6 months from start to sowing. Then 9 days to germinate.

96% germination in 5–9 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Draba p. 135Public domain
Show the original text
Draba (Brassicaceae). Most Draba are D-70 germinators. A comparison of the high germination of DS to low germination of fresh seed was given in Table 5-1. Sowing of fresh seed at 70 not only gives low germination, but is often fatal. D. compacta germ. best with seed DS 6 m at 70 in either 70(96% in 5-9 d) or 40(100% in less than 3 w). Fresh seed was curious in that germination was extended at 70 but not at 40 as shown by 40(80% in 3-7w) and 70(1%)-40(54% in 1-3 w)- 70(1%).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Draba p. 135. 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 3

DerivedN. C. Deno, 1993

Difficulty Low Rated by us, not by the source.

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

  1. Cold moist stratification

    Temperature: 40°F 4°C

Germination happens during step 1, in 49 days.

80% germination in 21–49 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Draba p. 135Public domain
Show the original text
Draba (Brassicaceae). Most Draba are D-70 germinators. A comparison of the high germination of DS to low germination of fresh seed was given in Table 5-1. Sowing of fresh seed at 70 not only gives low germination, but is often fatal. D. compacta germ. best with seed DS 6 m at 70 in either 70(96% in 5-9 d) or 40(100% in less than 3 w). Fresh seed was curious in that germination was extended at 70 but not at 40 as shown by 40(80% in 3-7w) and 70(1%)-40(54% in 1-3 w)- 70(1%).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Draba p. 135. 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 4

DerivedN. C. Deno, 1993

Difficulty High Rated by us, not by the source.

Start around December 15, 2026 for a May 3 last frost.

  1. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    1 germinated in this phase.

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    1 germinated in this phase.

Steps after step 2 run on after germination.

about 3 months from start to step 2. Germination happens during step 2, in 21 days.

54% germination in 7–21 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Draba p. 135Public domain
Show the original text
Draba (Brassicaceae). Most Draba are D-70 germinators. A comparison of the high germination of DS to low germination of fresh seed was given in Table 5-1. Sowing of fresh seed at 70 not only gives low germination, but is often fatal. D. compacta germ. best with seed DS 6 m at 70 in either 70(96% in 5-9 d) or 40(100% in less than 3 w). Fresh seed was curious in that germination was extended at 70 but not at 40 as shown by 40(80% in 3-7w) and 70(1%)-40(54% in 1-3 w)- 70(1%).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Draba p. 135. 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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