Deno’s Garden

Clethra fargesii

Genus Clethra

This source reports 4 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

Start around July 23, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 22, 2026.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

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

about 6 months from start to sowing. Then 77 days to germinate.

49% germination in 14–77 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Clethra p. 121Public domain
Show the original text
Clethra (Cletharaceae). Both species required light for germination. C. fargesli germ. 70L(15% in 2-11 w), 40-70L(49% in 2-11 w), and none in 70D, 70 GA-3, 40-70D, or outdoor treatment. A preliminary 6 w in 70D had no effect.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Clethra p. 121. 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 High Rated by us, not by the source.

Start around January 18, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 77 days to germinate.

15% germination in 14–77 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Clethra p. 121Public domain
Show the original text
Clethra (Cletharaceae). Both species required light for germination. C. fargesli germ. 70L(15% in 2-11 w), 40-70L(49% in 2-11 w), and none in 70D, 70 GA-3, 40-70D, or outdoor treatment. A preliminary 6 w in 70D had no effect.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Clethra p. 121. 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, Clethra p. 121Public domain
Show the original text
Clethra (Cletharaceae). Both species required light for germination. C. fargesli germ. 70L(15% in 2-11 w), 40-70L(49% in 2-11 w), and none in 70D, 70 GA-3, 40-70D, or outdoor treatment. A preliminary 6 w in 70D had no effect.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Clethra p. 121. Quoted exactly. Every value on this card comes from this record; the step names come from a fixed list.

Protocol 4

DerivedN. C. Deno, 1993

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

  1. Sow outdoors and leave it

    Nothing germinated outdoors.

No stated waiting before sowing.

0% germination.

This source doesn't state how long.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Clethra p. 121Public domain
Show the original text
Clethra (Cletharaceae). Both species required light for germination. C. fargesli germ. 70L(15% in 2-11 w), 40-70L(49% in 2-11 w), and none in 70D, 70 GA-3, 40-70D, or outdoor treatment. A preliminary 6 w in 70D had no effect.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Clethra p. 121. 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.