Deno’s Garden

Rhododendron lepidotum

Genus Rhododendron

This source reports 5 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Low Rated by us, not by the source.

Start around March 21, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 15 days to germinate.

85% germination in 10–15 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Rhododendron p. 204Public domain
Show the original text
Rhododendron (Ericaceae). Usually light was required for germination. R. lepidotum from Kashmir germ. best in 70L(30% in 5-10'd). Germination was reduced to 4% if the seed were. kept just 3 w in 70D before shifting to 70L. Seed also germ. 40-70L(2/7) and 40-70D(1/6). The promotion by light was confirmed with a sample from Nepal which germ. 70L(85% in 10-15 d) and 70D(26% in 3rd w). After 4 w the sample in 70D was shifted to 70L whereupon 40% germ. in 3rd w. However another sample from Nepal germ. 100% in 3rd w in either 70L or 700. The identifications are obviously in question, but the results do confirm the general tendency for germination in Rhododendron to be promoted by light.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Rhododendron p. 204. 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. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Germination time not stated; 21 days assumed.

30% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Rhododendron p. 204Public domain
Show the original text
Rhododendron (Ericaceae). Usually light was required for germination. R. lepidotum from Kashmir germ. best in 70L(30% in 5-10'd). Germination was reduced to 4% if the seed were. kept just 3 w in 70D before shifting to 70L. Seed also germ. 40-70L(2/7) and 40-70D(1/6). The promotion by light was confirmed with a sample from Nepal which germ. 70L(85% in 10-15 d) and 70D(26% in 3rd w). After 4 w the sample in 70D was shifted to 70L whereupon 40% germ. in 3rd w. However another sample from Nepal germ. 100% in 3rd w in either 70L or 700. The identifications are obviously in question, but the results do confirm the general tendency for germination in Rhododendron to be promoted by light.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Rhododendron p. 204. 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 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: light

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

29% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Rhododendron p. 204Public domain
Show the original text
Rhododendron (Ericaceae). Usually light was required for germination. R. lepidotum from Kashmir germ. best in 70L(30% in 5-10'd). Germination was reduced to 4% if the seed were. kept just 3 w in 70D before shifting to 70L. Seed also germ. 40-70L(2/7) and 40-70D(1/6). The promotion by light was confirmed with a sample from Nepal which germ. 70L(85% in 10-15 d) and 70D(26% in 3rd w). After 4 w the sample in 70D was shifted to 70L whereupon 40% germ. in 3rd w. However another sample from Nepal germ. 100% in 3rd w in either 70L or 700. The identifications are obviously in question, but the results do confirm the general tendency for germination in Rhododendron to be promoted by light.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Rhododendron p. 204. 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 4

DerivedN. C. Deno, 1993

Difficulty 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: dark

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

26% germination in 21 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Rhododendron p. 204Public domain
Show the original text
Rhododendron (Ericaceae). Usually light was required for germination. R. lepidotum from Kashmir germ. best in 70L(30% in 5-10'd). Germination was reduced to 4% if the seed were. kept just 3 w in 70D before shifting to 70L. Seed also germ. 40-70L(2/7) and 40-70D(1/6). The promotion by light was confirmed with a sample from Nepal which germ. 70L(85% in 10-15 d) and 70D(26% in 3rd w). After 4 w the sample in 70D was shifted to 70L whereupon 40% germ. in 3rd w. However another sample from Nepal germ. 100% in 3rd w in either 70L or 700. The identifications are obviously in question, but the results do confirm the general tendency for germination in Rhododendron to be promoted by light.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Rhododendron p. 204. 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 5

DerivedN. C. Deno, 1993

Difficulty 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.

17% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Rhododendron p. 204Public domain
Show the original text
Rhododendron (Ericaceae). Usually light was required for germination. R. lepidotum from Kashmir germ. best in 70L(30% in 5-10'd). Germination was reduced to 4% if the seed were. kept just 3 w in 70D before shifting to 70L. Seed also germ. 40-70L(2/7) and 40-70D(1/6). The promotion by light was confirmed with a sample from Nepal which germ. 70L(85% in 10-15 d) and 70D(26% in 3rd w). After 4 w the sample in 70D was shifted to 70L whereupon 40% germ. in 3rd w. However another sample from Nepal germ. 100% in 3rd w in either 70L or 700. The identifications are obviously in question, but the results do confirm the general tendency for germination in Rhododendron to be promoted by light.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Rhododendron p. 204. 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.