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Agastache occidentalis

Western Giant Hyssop

Family LamiaceaeGenus Agastache

A black and white view of a dense stand of upright stems, each topped by a pale flower spike, above coarsely toothed leaves
The whole plantDouglas C. IngramPublic domain

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/herb, SubshrubPLANTS Database
Native range
WashingtonGBIF 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; PLANTS Database — USDA NRCS; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

This source reports 5 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Low Rated by us, not by the source.

  1. Sow outdoors and leave it

    Up in late March.

No stated waiting before sowing.

100% germination.

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

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Agastache p. 16Public domain
Show the original text
Agastache (Lamiaceae). Light was required for the two species studied. A. occidentalis germ. 70L(68% on 5th d), 70 GA-3(74% in 5-8 d), 70D(none), 40(14%)-70D(11%), and 100% in late March in OT. It is unusual for OT and 70L to be the two treatments to give germination. Seeds DS 2 y germ. 70L(26% in 4-8 d) and 70D(none) showing significant dying of the seeds and retention of the light requirement.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Agastache p. 16. 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 Low Rated by us, not by the source.

Start around March 28, 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 8 days to germinate.

74% germination in 5–8 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Agastache p. 16Public domain
Show the original text
Agastache (Lamiaceae). Light was required for the two species studied. A. occidentalis germ. 70L(68% on 5th d), 70 GA-3(74% in 5-8 d), 70D(none), 40(14%)-70D(11%), and 100% in late March in OT. It is unusual for OT and 70L to be the two treatments to give germination. Seeds DS 2 y germ. 70L(26% in 4-8 d) and 70D(none) showing significant dying of the seeds and retention of the light requirement.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Agastache p. 16. 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, 1996

Difficulty Moderate Rated by us, not by the source.

Start around March 31, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 5 days to germinate.

68% germination in 5 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Agastache p. 16Public domain
Show the original text
Agastache (Lamiaceae). Light was required for the two species studied. A. occidentalis germ. 70L(68% on 5th d), 70 GA-3(74% in 5-8 d), 70D(none), 40(14%)-70D(11%), and 100% in late March in OT. It is unusual for OT and 70L to be the two treatments to give germination. Seeds DS 2 y germ. 70L(26% in 4-8 d) and 70D(none) showing significant dying of the seeds and retention of the light requirement.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Agastache p. 16. 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, 1996

Difficulty High Rated by us, not by the source.

Start around March 29, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on March 28, 2025.

  1. Dry storage

    Duration: 730 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: light

about 2 years from start to sowing. Then 8 days to germinate.

26% germination in 4–8 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Agastache p. 16Public domain
Show the original text
Agastache (Lamiaceae). Light was required for the two species studied. A. occidentalis germ. 70L(68% on 5th d), 70 GA-3(74% in 5-8 d), 70D(none), 40(14%)-70D(11%), and 100% in late March in OT. It is unusual for OT and 70L to be the two treatments to give germination. Seeds DS 2 y germ. 70L(26% in 4-8 d) and 70D(none) showing significant dying of the seeds and retention of the light requirement.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Agastache p. 16. 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 5

DerivedN. C. Deno, 1996

Difficulty High Rated by us, not by the source.

Start around March 15, 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: dark

    11 germinated in this phase.

Steps after step 1 run on after germination.

Germination happens during step 1; time not stated, 21 days assumed.

14% germination.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Agastache p. 16Public domain
Show the original text
Agastache (Lamiaceae). Light was required for the two species studied. A. occidentalis germ. 70L(68% on 5th d), 70 GA-3(74% in 5-8 d), 70D(none), 40(14%)-70D(11%), and 100% in late March in OT. It is unusual for OT and 70L to be the two treatments to give germination. Seeds DS 2 y germ. 70L(26% in 4-8 d) and 70D(none) showing significant dying of the seeds and retention of the light requirement.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Agastache p. 16. 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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