Deno’s Garden

Calyptridium umbellatum

Genus Calyptridium

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

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

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

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

60% germination in 7–21 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Calyptridium p. 110Public domain
Show the original text
Calyptridium (Portulacaceae). C. umbellatum germ. best in 70L(60% in 1- 3 w) and none in 70D. Germination also occurs at 40(35% in 3rd w) in the dark. Interestingly, when this latter sample was shifted to 70 after the 3 m at 40, the half placed in light germ. an additional 46% whereas there was no further germination in the half kept in 70D. This curious situation needs further study.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Calyptridium p. 110. 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 Moderate Rated by us, not by the source.

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

  1. Cold moist stratification

    Temperature: 40°F 4°C

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

35% germination in 21 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Calyptridium p. 110Public domain
Show the original text
Calyptridium (Portulacaceae). C. umbellatum germ. best in 70L(60% in 1- 3 w) and none in 70D. Germination also occurs at 40(35% in 3rd w) in the dark. Interestingly, when this latter sample was shifted to 70 after the 3 m at 40, the half placed in light germ. an additional 46% whereas there was no further germination in the half kept in 70D. This curious situation needs further study.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Calyptridium p. 110. 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

  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 ed. — N. C. Deno, 1993 · Ch. 20, Calyptridium p. 110Public domain
Show the original text
Calyptridium (Portulacaceae). C. umbellatum germ. best in 70L(60% in 1- 3 w) and none in 70D. Germination also occurs at 40(35% in 3rd w) in the dark. Interestingly, when this latter sample was shifted to 70 after the 3 m at 40, the half placed in light germ. an additional 46% whereas there was no further germination in the half kept in 70D. This curious situation needs further study.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Calyptridium p. 110. Quoted exactly. Every value on this card comes from this record; the step names come from a fixed list.