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Triglochin maritima

Arrow-grass · Sea Arrow-grass · Seaside Arrow-grass · Seaside Arrowgrass

Family JuncaginaceaeGenus Triglochin

A tuft of narrow fleshy leaves with one slim green flower spike standing among them, at the muddy edge of shallow water.
The whole plantElke FreeseCC BY 2.5

About the plant

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

Habit
rhizomatous geophytePlants of the World Online
Habit
Perennial, GraminoidPLANTS Database
Flower
GreenFlora of China
Native range
Afghanistan, Alaska, Alberta, Algeria, Altay, Argentina Northeast 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; Flora of China — Wu Zhengyi, Peter H. Raven and Hong Deyuan (eds.); GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

Worth knowing

  • Believed to be toxic because it can produce cyanide, usually when stressed by drought or over-harvesting. In the British Isles it is common on the coast but very rare inland. Wikipedia: Triglochin maritima

This source reports 7 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Low Rated by us, not by the source.

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

  1. Dry storage

    Duration: 240 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: light

about 8 months from start to sowing. Then 6 days to germinate.

100% germination in 4–6 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Triglochin p. 82Public domain
Show the original text
Triglochin (Scheuchzeriaceae). T. maritima DS 8 m germ. 70L(100% in 4-6 d), 70 GA-3(100% on 8th d), 70D(38% largely in 4-6 d), 40{1 %)-70L( 100% in 2-4 d), and 40(1%)-70D(25% in 5th d). Seeds DS 20 m germ. 70L(60% in 6-12 d) and 70D(14% in 8-20 d) showing that significant dying had occurred, and seeds DS 2 y were dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Triglochin p. 82. 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 August 5, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on August 4, 2026.

  1. Dry storage

    Duration: 240 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: light

about 8 months from start to sowing. Then 4 days to germinate.

100% germination in 2–4 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Triglochin p. 82Public domain
Show the original text
Triglochin (Scheuchzeriaceae). T. maritima DS 8 m germ. 70L(100% in 4-6 d), 70 GA-3(100% on 8th d), 70D(38% largely in 4-6 d), 40{1 %)-70L( 100% in 2-4 d), and 40(1%)-70D(25% in 5th d). Seeds DS 20 m germ. 70L(60% in 6-12 d) and 70D(14% in 8-20 d) showing that significant dying had occurred, and seeds DS 2 y were dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Triglochin p. 82. 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 Low Rated by us, not by the source.

Start around August 1, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 31, 2026.

  1. Dry storage

    Duration: 240 daysTemperature: 70°F 21°C

  2. Gibberellic acid soak

  3. Sow and cover

    Temperature: 70°F 21°C

about 8 months from start to sowing. Then 8 days to germinate.

100% germination in 8 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Triglochin p. 82Public domain
Show the original text
Triglochin (Scheuchzeriaceae). T. maritima DS 8 m germ. 70L(100% in 4-6 d), 70 GA-3(100% on 8th d), 70D(38% largely in 4-6 d), 40{1 %)-70L( 100% in 2-4 d), and 40(1%)-70D(25% in 5th d). Seeds DS 20 m germ. 70L(60% in 6-12 d) and 70D(14% in 8-20 d) showing that significant dying had occurred, and seeds DS 2 y were dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Triglochin p. 82. 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 Moderate Rated by us, not by the source.

Start around August 2, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on August 1, 2025.

  1. Dry storage

    Duration: 600 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: light

about 1.5 years from start to sowing. Then 12 days to germinate.

60% germination in 6–12 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Triglochin p. 82Public domain
Show the original text
Triglochin (Scheuchzeriaceae). T. maritima DS 8 m germ. 70L(100% in 4-6 d), 70 GA-3(100% on 8th d), 70D(38% largely in 4-6 d), 40{1 %)-70L( 100% in 2-4 d), and 40(1%)-70D(25% in 5th d). Seeds DS 20 m germ. 70L(60% in 6-12 d) and 70D(14% in 8-20 d) showing that significant dying had occurred, and seeds DS 2 y were dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Triglochin p. 82. 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 5

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

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

  1. Dry storage

    Duration: 240 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: dark

about 8 months from start to sowing. Then 6 days to germinate.

38% germination in 4–6 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Triglochin p. 82Public domain
Show the original text
Triglochin (Scheuchzeriaceae). T. maritima DS 8 m germ. 70L(100% in 4-6 d), 70 GA-3(100% on 8th d), 70D(38% largely in 4-6 d), 40{1 %)-70L( 100% in 2-4 d), and 40(1%)-70D(25% in 5th d). Seeds DS 20 m germ. 70L(60% in 6-12 d) and 70D(14% in 8-20 d) showing that significant dying had occurred, and seeds DS 2 y were dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Triglochin p. 82. 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 6

DerivedN. C. Deno, 1996

Difficulty High Rated by us, not by the source.

Start around May 6, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on May 5, 2026.

  1. Dry storage

    Duration: 240 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    1 germinated in this phase.

  3. Warm moist stratification

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

about 11 months from start to step 3. Germination happens during step 3, in 5 days.

25% germination in 5 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Triglochin p. 82Public domain
Show the original text
Triglochin (Scheuchzeriaceae). T. maritima DS 8 m germ. 70L(100% in 4-6 d), 70 GA-3(100% on 8th d), 70D(38% largely in 4-6 d), 40{1 %)-70L( 100% in 2-4 d), and 40(1%)-70D(25% in 5th d). Seeds DS 20 m germ. 70L(60% in 6-12 d) and 70D(14% in 8-20 d) showing that significant dying had occurred, and seeds DS 2 y were dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Triglochin p. 82. 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 7

DerivedN. C. Deno, 1996

Difficulty High Rated by us, not by the source.

Start around July 25, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 24, 2025.

  1. Dry storage

    Duration: 600 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: dark

about 1.5 years from start to sowing. Then 20 days to germinate.

14% germination in 8–20 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Triglochin p. 82Public domain
Show the original text
Triglochin (Scheuchzeriaceae). T. maritima DS 8 m germ. 70L(100% in 4-6 d), 70 GA-3(100% on 8th d), 70D(38% largely in 4-6 d), 40{1 %)-70L( 100% in 2-4 d), and 40(1%)-70D(25% in 5th d). Seeds DS 20 m germ. 70L(60% in 6-12 d) and 70D(14% in 8-20 d) showing that significant dying had occurred, and seeds DS 2 y were dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Triglochin p. 82. 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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