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Tripleurospermum maritimum

Sea Mayweed · False Mayweed

Family AsteraceaeGenus Tripleurospermum

Also published as Matricaria maritima. You are in the right place.

A sprawling mat of feathery green foliage studded with small white daisies, spreading across wet gray beach sand.
The whole plantIan CunliffeCC BY-SA 2.0

About the plant

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

Habit
perennialPlants of the World Online
Flower
WhiteRead from the photograph on this page

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.

Worth knowing

  • Sea mayweed grows on coasts of northern Europe, including Scandinavia and Iceland, often in sand or among beach pebbles. Maritimum comes from mare, sea. Wikipedia: Tripleurospermum maritimum

This source reports 6 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Low Rated by us, not by the source.

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

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

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

100% germination in 14 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Matricaria p. 57Public domain
Show the original text
Matricaria (Asteraceae). M. maritima germ. 70L(100% in 2nd w), 70 GA-3(100% in 3rd w), 70D(55% in 2- 4 d), OT(10% in April), and 40-70D(none). The effect of light declined on DS, and seeds DS 6 m germ. 70D(80% on 3rd d) and 70L(100% on 3rd d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Matricaria p. 57. 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 October 5, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on October 4, 2026.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: light

about 6 months from start to sowing. Then 3 days to germinate.

100% germination in 3 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Matricaria p. 57Public domain
Show the original text
Matricaria (Asteraceae). M. maritima germ. 70L(100% in 2nd w), 70 GA-3(100% in 3rd w), 70D(55% in 2- 4 d), OT(10% in April), and 40-70D(none). The effect of light declined on DS, and seeds DS 6 m germ. 70D(80% on 3rd d) and 70L(100% on 3rd d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Matricaria p. 57. 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 March 15, 2027 for a May 3 last frost.

  1. Gibberellic acid soak

  2. Sow and cover

    Temperature: 70°F 21°C

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

100% germination in 21 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Matricaria p. 57Public domain
Show the original text
Matricaria (Asteraceae). M. maritima germ. 70L(100% in 2nd w), 70 GA-3(100% in 3rd w), 70D(55% in 2- 4 d), OT(10% in April), and 40-70D(none). The effect of light declined on DS, and seeds DS 6 m germ. 70D(80% on 3rd d) and 70L(100% on 3rd d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Matricaria p. 57. 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 Low Rated by us, not by the source.

Start around October 5, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on October 4, 2026.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: dark

about 6 months from start to sowing. Then 3 days to germinate.

80% germination in 3 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Matricaria p. 57Public domain
Show the original text
Matricaria (Asteraceae). M. maritima germ. 70L(100% in 2nd w), 70 GA-3(100% in 3rd w), 70D(55% in 2- 4 d), OT(10% in April), and 40-70D(none). The effect of light declined on DS, and seeds DS 6 m germ. 70D(80% on 3rd d) and 70L(100% on 3rd d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Matricaria p. 57. 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 April 1, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Then 4 days to germinate.

55% germination in 2–4 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Matricaria p. 57Public domain
Show the original text
Matricaria (Asteraceae). M. maritima germ. 70L(100% in 2nd w), 70 GA-3(100% in 3rd w), 70D(55% in 2- 4 d), OT(10% in April), and 40-70D(none). The effect of light declined on DS, and seeds DS 6 m germ. 70D(80% on 3rd d) and 70L(100% on 3rd d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Matricaria p. 57. 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.

  1. Sow outdoors and leave it

    Up in April.

No stated waiting before sowing.

10% germination.

This source doesn't state how long step 1 lasts.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Matricaria p. 57Public domain
Show the original text
Matricaria (Asteraceae). M. maritima germ. 70L(100% in 2nd w), 70 GA-3(100% in 3rd w), 70D(55% in 2- 4 d), OT(10% in April), and 40-70D(none). The effect of light declined on DS, and seeds DS 6 m germ. 70D(80% on 3rd d) and 70L(100% on 3rd d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Matricaria p. 57. 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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