Deno’s GardenMy Garden

Jamesia americana

Cliff Jamesia · Cliffbush · Fivepetal Cliffbush

Family HydrangeaceaeGenus Jamesia

Clusters of small white flowers nodding above deeply veined toothed leaves
Flowerpeganum from Small Dole, EnglandCC BY-SA 2.0

About the plant

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

The plant

Habit
shrubPlants of the World Online
Habit
Perennial, ShrubPLANTS Database
Height
6.0 ft1.8 mPLANTS Database
Flower
WhitePLANTS Database
Blooms
Early SpringPLANTS Database
Native range
Arizona, California, Colorado, Mexico Northeast, Nevada, New Mexico and elsewhereGBIF Backbone Taxonomy

Growing conditions

Sun
Shade tolerance: HighPLANTS Database
Soil
Adapted to coarse, medium textured soilsPLANTS Database
Soil pH
7.0-8.5PLANTS Database
Moisture
Moisture use: MediumPLANTS Database
Watering
Drought tolerance: HighPLANTS 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; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1996

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. Then 21 days to germinate.

67% germination in 7–21 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Jamesia p. 51Public domain
Show the original text
Jamesia (Saxifragaceae). J. americana germ. 70L(67% in 1-3 w), 70 GA-3(32% in 2nd w), and 70D(none) confirming a report (JH) that light is required
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Jamesia p. 51. 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 Moderate Rated by us, not by the source.

Start around March 22, 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 14 days to germinate.

32% germination in 14 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Jamesia p. 51Public domain
Show the original text
Jamesia (Saxifragaceae). J. americana germ. 70L(67% in 1-3 w), 70 GA-3(32% in 2nd w), and 70D(none) confirming a report (JH) that light is required
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Jamesia p. 51. 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

Add to My Garden

View species page