Deno’s GardenMy Garden

Mertensia maritima

Genus Mertensia

Trailing stems of blue-grey oval leaves spreading over grey beach cobbles, tipped with small pink and pale blue flowers.
The whole plantNo machine-readable author provided. Dlanglois assumed (based on copyright claims).CC BY-SA 3.0

This source reports 4 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

Start around March 27, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 9 days to germinate.

50% germination in 5–9 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Mertensia p. 58Public domain
Show the original text
Mertensia (Boraginaceae). M. maritima germ. 70L(50% in 5-9 d), 70 GA-3{25% in 5-12 d), OS(43% in 2nd w), OT(15% in October), 70D(none), and 40- 70D(20% on 6th d). It is remarkable that light, GA-3, 40-70D, and oscitlating temperatures initiate germination, but none germ. in 70D. The seeds are enclosed in a black ioose outer seed coat. The thin narrow seeds were laboriously removed from the outer seed coat before treatment.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Mertensia p. 58. 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 Moderate Rated by us, not by the source.

Start around March 22, 2027 for a May 3 last frost.

  1. Alternating temperatures

    Temperature: 40–70°F 4–21°C

No stated waiting before sowing. Then 14 days to germinate.

43% germination in 14 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Mertensia p. 58Public domain
Show the original text
Mertensia (Boraginaceae). M. maritima germ. 70L(50% in 5-9 d), 70 GA-3{25% in 5-12 d), OS(43% in 2nd w), OT(15% in October), 70D(none), and 40- 70D(20% on 6th d). It is remarkable that light, GA-3, 40-70D, and oscitlating temperatures initiate germination, but none germ. in 70D. The seeds are enclosed in a black ioose outer seed coat. The thin narrow seeds were laboriously removed from the outer seed coat before treatment.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Mertensia p. 58. 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, 1996

Difficulty High Rated by us, not by the source.

Start around October 2, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on October 1, 2026.

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

20% germination in 6 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Mertensia p. 58Public domain
Show the original text
Mertensia (Boraginaceae). M. maritima germ. 70L(50% in 5-9 d), 70 GA-3{25% in 5-12 d), OS(43% in 2nd w), OT(15% in October), 70D(none), and 40- 70D(20% on 6th d). It is remarkable that light, GA-3, 40-70D, and oscitlating temperatures initiate germination, but none germ. in 70D. The seeds are enclosed in a black ioose outer seed coat. The thin narrow seeds were laboriously removed from the outer seed coat before treatment.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Mertensia p. 58. 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, 1996

Difficulty High Rated by us, not by the source.

  1. Sow outdoors and leave it

    Up in October.

No stated waiting before sowing.

15% germination.

This source doesn't state how long.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Mertensia p. 58Public domain
Show the original text
Mertensia (Boraginaceae). M. maritima germ. 70L(50% in 5-9 d), 70 GA-3{25% in 5-12 d), OS(43% in 2nd w), OT(15% in October), 70D(none), and 40- 70D(20% on 6th d). It is remarkable that light, GA-3, 40-70D, and oscitlating temperatures initiate germination, but none germ. in 70D. The seeds are enclosed in a black ioose outer seed coat. The thin narrow seeds were laboriously removed from the outer seed coat before treatment.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Mertensia p. 58. 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.

Add to My Garden

View species page