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Potentilla megalantha

Large-flowered Cinquefoil

Family RosaceaeGenus Potentilla

Broad yellow flowers with orange centers and a ring of orange stamens, one with a small fly on it, above gray-green leaves.
FlowerHedwig StorchCC BY-SA 3.0

About the plant

What it is and where it grows — not part of any germination protocol.

Habit
perennialPlants of the World Online
Flower
Bright yellowOrnamental Plants From Russia And Adjacent States Of The Former Soviet Union
Native range
Japan, Kamchatka, Kuril Is., SakhalinGBIF Backbone Taxonomy

Toxicity is noted only where a source states it. No note here is not a finding of safety.

Sources: Plants of the World Online — Royal Botanic Gardens, Kew; Ornamental Plants From Russia And Adjacent States Of The Former Soviet Union; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

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 January 1, 2027 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: light

about 3 months from start to step 2. Germination happens during step 2, in 4 days.

100% germination in 4 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Potentilla p. 196Public domain
Show the original text
Potentilla (Rosaceae). P. megalantha germ. 70L(65% in 2nd w), 70D GA-3(50% in 4th w), 70D(7%), 40- 70L(100% in 4th d), and -40-70D(none). These seeds had been DS for 6 m. There was evidence that DS for a y removed much of the light requirement.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Potentilla p. 196. 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 22, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 14 days to germinate.

65% germination in 14 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Potentilla p. 196Public domain
Show the original text
Potentilla (Rosaceae). P. megalantha germ. 70L(65% in 2nd w), 70D GA-3(50% in 4th w), 70D(7%), 40- 70L(100% in 4th d), and -40-70D(none). These seeds had been DS for 6 m. There was evidence that DS for a y removed much of the light requirement.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Potentilla p. 196. 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 Moderate Rated by us, not by the source.

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

  1. Gibberellic acid soak

  2. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Then 28 days to germinate.

50% germination in 28 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Potentilla p. 196Public domain
Show the original text
Potentilla (Rosaceae). P. megalantha germ. 70L(65% in 2nd w), 70D GA-3(50% in 4th w), 70D(7%), 40- 70L(100% in 4th d), and -40-70D(none). These seeds had been DS for 6 m. There was evidence that DS for a y removed much of the light requirement.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Potentilla p. 196. 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 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: dark

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

7% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Potentilla p. 196Public domain
Show the original text
Potentilla (Rosaceae). P. megalantha germ. 70L(65% in 2nd w), 70D GA-3(50% in 4th w), 70D(7%), 40- 70L(100% in 4th d), and -40-70D(none). These seeds had been DS for 6 m. There was evidence that DS for a y removed much of the light requirement.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Potentilla p. 196. 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.

How each step is done, in Deno’s words, and what Verified and Derived mean.

Germination trials

Readers’ own records of sowing this species, published after review. Share your trial · All trials

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