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Scleranthus biflorus

Knawel · Two-flower Knawel

Family CaryophyllaceaeGenus Scleranthus

Firm green cushions like moss-covered boulders, spreading in low mounds over gray gravel beside a small plant label.
The whole plantEncycloPeteyCC BY-SA 3.0

About the plant

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

Flower
GreenWikipedia
Native range
New South Wales, New Zealand North, New Zealand South, Tasmania, VictoriaGBIF Backbone Taxonomy

Toxicity is noted only where a source states it. No note here is not a finding of safety.

Sources: Wikipedia — Wikipedia contributors; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

Worth knowing

  • Twin-flower knawel is a cushion plant of grassland in Australia and New Zealand, especially at higher altitudes. As of 2015 the species was under review, with new taxa planned. Wikipedia: Scleranthus biflorus

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Very high Rated by us, not by the source.

Start around May 15, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on May 14, 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

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  4. Warm moist stratification

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

about 9 months from start to step 4. Germination happens during step 4, in 56 days.

1% germination in 56 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Scleranthus p. 61Public domain
Show the original text
Scleranthus (Caryophyllaceae). S. biforus germ. 40-70D-40-70D(1/93 in 8th w) and none in 70D-40-70D-40- 70D.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Scleranthus p. 61. 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, 1998

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing.

0% germination.

Nothing germinated at 70.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Scleranthus p. 61Public domain
Show the original text
Scleranthus (Caryophyllaceae). S. biforus germ. 40-70D-40-70D(1/93 in 8th w) and none in 70D-40-70D-40- 70D.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Scleranthus p. 61. Quoted exactly. Every value on this card comes from this record; 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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