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Elliottia paniculata

Spike Azalea

Family EricaceaeGenus Elliottia

White flowers with narrow curled petals and clusters of green berries along red-stemmed leafy shoots
FlowerKENPEICC BY-SA 3.0

About the plant

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

Habit
shrubPlants of the World Online
Flower
WhiteRead from the photograph on this page
Native range
JapanGBIF 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; Read from the photograph on this page — Deno's Garden; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Low Rated by us, not by the source.

Start around September 17, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 16, 2026.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: light

about 6 months from start to sowing. Then 21 days to germinate.

100% germination in 21 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Tripetaleia p. 66Public domain
Show the original text
Tripetaleia (Ericaceae). T: paniculata DS 6 m germ. 70L(100% in 3rd w), 70D(none), 40-70L(100% ïn 3-11 d), and 40-70D(none). When the seeds in 70D were shifted to 70L after 4 w, 58% germ. in the 2nd w. Seeds DS 1 y werê dead.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Tripetaleia p. 66. 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, 1998

Difficulty Moderate Rated by us, not by the source.

Start around June 29, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on June 28, 2026.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

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

about 9 months from start to step 3. Germination happens during step 3, in 11 days.

100% germination in 3–11 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Tripetaleia p. 66Public domain
Show the original text
Tripetaleia (Ericaceae). T: paniculata DS 6 m germ. 70L(100% in 3rd w), 70D(none), 40-70L(100% ïn 3-11 d), and 40-70D(none). When the seeds in 70D were shifted to 70L after 4 w, 58% germ. in the 2nd w. Seeds DS 1 y werê dead.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Tripetaleia p. 66. 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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