Deno’s Garden

Arctostaphylos pungens

Genus Arctostaphylos

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty High Rated by us, not by the source.

Start around February 8, 2027 for a May 3 last frost.

  1. Gibberellic acid soak

  2. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing. Then 56 days to germinate.

12% germination in 56 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Arctostaphylos p. 99Public domain
Show the original text
Arctostaphylos (Erlcaceae). Wild collected seeds of seven species were studied. The seeds vary greatly in size. Only the larger seeds ever germ., and the undersize seeds were not counted. Puncturing the seed coats had no effect so the long extended germinations do not seem to be a question of impervious seed coats despite a literature claim that A. pungens germ. 70 GA-3(2/16 in 8th w), 70L(1/60), 70D(none), and 40- 70D(1/60). The experiments are only for 14 wand are incomplete.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Arctostaphylos p. 99. 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 Very high 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. Germination time not stated; 21 days assumed.

2% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Arctostaphylos p. 99Public domain
Show the original text
Arctostaphylos (Erlcaceae). Wild collected seeds of seven species were studied. The seeds vary greatly in size. Only the larger seeds ever germ., and the undersize seeds were not counted. Puncturing the seed coats had no effect so the long extended germinations do not seem to be a question of impervious seed coats despite a literature claim that A. pungens germ. 70 GA-3(2/16 in 8th w), 70L(1/60), 70D(none), and 40- 70D(1/60). The experiments are only for 14 wand are incomplete.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Arctostaphylos p. 99. 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

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

Start around September 17, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 16, 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

about 6 months from start to sowing. Germination time not stated; 21 days assumed.

2% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Arctostaphylos p. 99Public domain
Show the original text
Arctostaphylos (Erlcaceae). Wild collected seeds of seven species were studied. The seeds vary greatly in size. Only the larger seeds ever germ., and the undersize seeds were not counted. Puncturing the seed coats had no effect so the long extended germinations do not seem to be a question of impervious seed coats despite a literature claim that A. pungens germ. 70 GA-3(2/16 in 8th w), 70L(1/60), 70D(none), and 40- 70D(1/60). The experiments are only for 14 wand are incomplete.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Arctostaphylos p. 99. 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.