Deno’s Garden

Costus guanaiensis

Genus Costus

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

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

Start around December 1, 2026 for a May 3 last frost.

  1. Warm moist stratification

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

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

Steps after step 1 run on after germination.

about 3 months from start to sowing. Then 35 days to germinate.

4% germination in 35 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Costus p. 33Public domain
Show the original text
Costus (Zingiberaceae). C. guanaiensis germ. 70L(1/26 in 5th w)-40, 70D(1/27 in 10th w)-40, and none in 70 GA-3. The ungerm. seed coats appeared to be all empties so that the germination could approach 100% if these are discounted.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Costus p. 33. 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 Very high Rated by us, not by the source.

Start around October 27, 2026 for a May 3 last frost.

  1. Warm moist stratification

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

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

Steps after step 1 run on after germination.

about 3 months from start to sowing. Then 70 days to germinate.

4% germination in 70 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Costus p. 33Public domain
Show the original text
Costus (Zingiberaceae). C. guanaiensis germ. 70L(1/26 in 5th w)-40, 70D(1/27 in 10th w)-40, and none in 70 GA-3. The ungerm. seed coats appeared to be all empties so that the germination could approach 100% if these are discounted.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Costus p. 33. 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

  1. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing.

0% germination.

Nothing germinated at 70.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Costus p. 33Public domain
Show the original text
Costus (Zingiberaceae). C. guanaiensis germ. 70L(1/26 in 5th w)-40, 70D(1/27 in 10th w)-40, and none in 70 GA-3. The ungerm. seed coats appeared to be all empties so that the germination could approach 100% if these are discounted.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Costus p. 33. Quoted exactly. Every value on this card comes from this record; the step names come from a fixed list.