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Delphinium × barlowii

Genus Delphinium

Also published as Delphinium belladonna. You are in the right place.

Open deep blue flowers with dark centres on a loose, slender flower spike
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.

Toxicity
Poisonous to cattle, humans, goats. All parts. Alkaloids delphinine, ajacine, and others. Stated for Delphinium spp.Plants Poisonous to Livestock

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

Source: Plants Poisonous to Livestock — Cornell University Department of Animal Science.

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

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

  1. Cold moist stratification

    Temperature: 40°F 4°C

No stated waiting before sowing. Then 35 days to germinate.

63% germination in 35 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Delphinium p. 130Public domain
Show the original text
Delphinium (Ranunculaceae). . This genus is composed of a group of medium heigth monocarpic species typified by D. belladonna germ. 70(50% in 10-12 ,d) and 40(63% in 5th w). Treatment with GA-3 had no effect on the rate or percent at 70.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Delphinium p. 130. 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

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

50% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Delphinium p. 130Public domain
Show the original text
Delphinium (Ranunculaceae). . This genus is composed of a group of medium heigth monocarpic species typified by D. belladonna germ. 70(50% in 10-12 ,d) and 40(63% in 5th w). Treatment with GA-3 had no effect on the rate or percent at 70.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Delphinium p. 130. 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.

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