Deno’s Garden

Amsonia jonesii

Genus Amsonia

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

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

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

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

about 6 months from start to sowing. Then 10 days to germinate.

83% germination in 10 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Amsonia p. 19Public domain
Show the original text
Amsonia (Apocyanaceae). A. jonesii germ. 70L(3/5 on 10th d), 70D(none), 40-70D(5/6 on 10th d), and 4/5 in April in OT. The 40-70D treatment is best, and it is remarkable that either 3 m at 40 or light initiate germination.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Amsonia p. 19. 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.

  1. Sow outdoors and leave it

    Up in April.

No stated waiting before sowing.

80% germination.

This source doesn't state how long.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Amsonia p. 19Public domain
Show the original text
Amsonia (Apocyanaceae). A. jonesii germ. 70L(3/5 on 10th d), 70D(none), 40-70D(5/6 on 10th d), and 4/5 in April in OT. The 40-70D treatment is best, and it is remarkable that either 3 m at 40 or light initiate germination.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Amsonia p. 19. 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 Moderate Rated by us, not by the source.

Start around March 26, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 10 days to germinate.

60% germination in 10 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Amsonia p. 19Public domain
Show the original text
Amsonia (Apocyanaceae). A. jonesii germ. 70L(3/5 on 10th d), 70D(none), 40-70D(5/6 on 10th d), and 4/5 in April in OT. The 40-70D treatment is best, and it is remarkable that either 3 m at 40 or light initiate germination.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Amsonia p. 19. 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.