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Ipomopsis spicata

Spiked Ipomopsis

Family PolemoniaceaeGenus Ipomopsis

A crowded head of cream flowers on a woolly stem set with narrow gray-green leaves, on stony ground
FlowerMason Brock (Masebrock)Public 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/herbPLANTS Database
Flower
CreamWikipedia
Native range
Native to the 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; Wikipedia — Wikipedia contributors.

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 December 15, 2026 for a May 3 last frost.

  1. Warm moist stratification

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

    29 germinated in this phase.

  2. Cold moist stratification

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

about 3 months from start to step 2. Germination happens during step 2, in 21 days.

36% germination in 21 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Ipomopsis p. 156Public domain
Show the original text
Ipomopsis (Polemoniaceae). I. spicata germ. 70(29% in 5-10 d)-40(36% in 3rd w) and 40(22% in 12th w)- 70(22% in 8th d). Light had no effect.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Ipomopsis p. 156. 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 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

    22 germinated in this phase.

Steps after step 1 run on after germination.

Germination happens during step 1, in 84 days.

22% germination in 84 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Ipomopsis p. 156Public domain
Show the original text
Ipomopsis (Polemoniaceae). I. spicata germ. 70(29% in 5-10 d)-40(36% in 3rd w) and 40(22% in 12th w)- 70(22% in 8th d). Light had no effect.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Ipomopsis p. 156. 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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