Deno’s GardenMy Garden

Oreocarya thompsonii

Thompson's Cryptantha

Family BoraginaceaeGenus Oreocarya

A stem crowded with small white flowers with yellow eyes, every part of it bristling with long stiff white hairs, on stony ground.
FlowerJhorthosCC BY-SA 4.0

About the plant

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

Flower
WhiteWikipedia
Native range
Oregon, WashingtonGBIF Backbone Taxonomy

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

Sources: Wikipedia — Wikipedia contributors; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty High Rated by us, not by the source.

Start around February 1, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Then 63 days to germinate.

25% germination in 63 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Cryptantha p. 127Public domain
Show the original text
Cryptantha (Boraginaceae). C. thompsonii germ. 70D(1/4 in 9th w) and 70L-40(1/6 in 4th w).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Cryptantha p. 127. 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 High Rated by us, not by the source.

Start around December 8, 2026 for a May 3 last frost.

  1. Warm moist stratification

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

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

about 3 months from start to step 2. Germination happens during step 2, in 28 days.

17% germination in 28 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Cryptantha p. 127Public domain
Show the original text
Cryptantha (Boraginaceae). C. thompsonii germ. 70D(1/4 in 9th w) and 70L-40(1/6 in 4th w).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Cryptantha p. 127. 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