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Heuchera richardsonii

Richardson's Alumroot · Prairie Alumroot

Family SaxifragaceaeGenus Heuchera

A mound of scalloped, lobed green leaves on a pine-needle floor, thin stems of tiny flowers around it
The whole plantSuperior National ForestCC BY 2.0

About the plant

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

Habit
perennialPlants of the World Online
Habit
Perennial, Forb/herbPLANTS Database
Flower
Green, greenish whiteFlora of North America
Native range
Canada, lower 48 statesPLANTS Database

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; PLANTS Database — USDA NRCS; Flora of North America — Flora of North America Editorial Committee.

Two sources report 4 treatments between them. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing.

0% germination.

Nothing germinated at 70.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Heuchera p. 48Public domain
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Heuchera (Saxifragaceae). H. richardsonii seeds DS 0, 2 y, and 4 y germ. 94% in 1-3 w, 17% in 3rd w, and none in 70L and 89% in 1-3 w, none, and none in 70D.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Heuchera p. 48. Quoted exactly. Every value on this card comes from this record; the step names come from a fixed list.

Protocol 2

DerivedN. C. Deno, 1993

Difficulty Low Rated by us, not by the source.

Start around March 16, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: either

No stated waiting before sowing. Then 20 days to germinate.

92% germination in 8–20 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Heuchera p. 152Public domain
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Heuchera (Saxlfragaceae). The small seeds cannot be readily separated from the capsules and chaff so that seed counts are inaccurate. H, cylindrica germ. 70D(5% in 3rd w), 70L(13% in 3rd w), 40(4%)-70, and 40% in April in outdoor treatment. These behaviors contrast sharply with the behaviors of seeds that had been DS for 2 y. These germ. 70L(43% in 3rd w), .70D GA-3(31% in 2- 4 w), and 700(none). The GA-3 seedlings were normal. H. richardsonii germ. 70(92% in 8-20 d), 40(32% in 8-12 w)-70(10%), and 34% in outdoor treatment. Light had no effect.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Heuchera p. 152. 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.

  1. Sow outdoors and leave it

No stated waiting before sowing.

34% germination.

This source doesn't state how long step 1 lasts.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Heuchera p. 152Public domain
Show the original text
Heuchera (Saxlfragaceae). The small seeds cannot be readily separated from the capsules and chaff so that seed counts are inaccurate. H, cylindrica germ. 70D(5% in 3rd w), 70L(13% in 3rd w), 40(4%)-70, and 40% in April in outdoor treatment. These behaviors contrast sharply with the behaviors of seeds that had been DS for 2 y. These germ. 70L(43% in 3rd w), .70D GA-3(31% in 2- 4 w), and 700(none). The GA-3 seedlings were normal. H. richardsonii germ. 70(92% in 8-20 d), 40(32% in 8-12 w)-70(10%), and 34% in outdoor treatment. Light had no effect.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Heuchera p. 152. 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 Moderate Rated by us, not by the source.

Start around January 11, 2027 for a May 3 last frost.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C Light: either

  2. Warm moist stratification

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

    10 germinated in this phase.

Steps after step 1 run on after germination.

Germination happens during step 1, in 84 days.

32% germination in 56–84 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Heuchera p. 152Public domain
Show the original text
Heuchera (Saxlfragaceae). The small seeds cannot be readily separated from the capsules and chaff so that seed counts are inaccurate. H, cylindrica germ. 70D(5% in 3rd w), 70L(13% in 3rd w), 40(4%)-70, and 40% in April in outdoor treatment. These behaviors contrast sharply with the behaviors of seeds that had been DS for 2 y. These germ. 70L(43% in 3rd w), .70D GA-3(31% in 2- 4 w), and 700(none). The GA-3 seedlings were normal. H. richardsonii germ. 70(92% in 8-20 d), 40(32% in 8-12 w)-70(10%), and 34% in outdoor treatment. Light had no effect.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Heuchera p. 152. 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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