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Flower Acer_pseudosieboldianum_flowers.jpg: Abarmot
derivative work: Songbird11989 (talk) CC BY-SA 3.0 About the plant What it is and where it grows — not part of any germination protocol.
Habit tree Plants of the World Online
Flower White, yellowish white Flora of China
Native range Korea, Manchuria, Primorye GBIF 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; Flora of China — Wu Zhengyi, Peter H. Raven and Hong Deyuan (eds.); GBIF Backbone Taxonomy — Global Biodiversity Information Facility.
Worth knowing Korean maple stands cold better than the Japanese maple and has done well in North Dakota at −43 °F. The University of Wisconsin crossed the two to make a hardy hybrid, sold as Northern Glow. Wikipedia: Acer pseudosieboldianum For a May 3 last frost, start this around November 10, 2026 — about 6 months ahead.
This one takes two seasons. Start in November 2026 to plant out in May 2027.
Using a national average last frost of May 3, which is wrong for most places. Put in your zip code for your own dates. Plant words explained .
Protocol N. C. Deno, 1993 Difficulty Very high Rated by us, not by the source.
1 Cold moist stratification
Duration: 90 days · Temperature: 40°F 4°C
3 germinated in this phase.
2 Warm moist stratification
Duration: 90 days · Temperature: 70°F 21°C
about 3 months from start to step 2. Germination happens during step 2, in 56 days.
7% germination in 7–56 days.
Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Acer p. 83Public domain Show the original text Acer (Aceraceae). The three dominant themes in this genus are the diversity of germination behaviors, the presence of impervious seed coats in about half of the species, and the large percentages (90% an more) of empty seed coats in some of the samples even though the seeds were collected from thriving natural colonies. The genus divides into three groups. (a) Seeds ripen in late spring, germinate immediately at 70 (and 40), and do not survive dry storage. (b) Seeds ripen in fall, tolerate dry storage, and usually germinate at 40. (c) Seeds ripen in fall, usually tolerate dry storage, have an impervious seed coat, and mayor may not have inhibitors. The discovery of an impervious seed coat in A. pseudosieboldiana seeds germ. 40(3% in 12th w)-70(7% in 1-8 w) and 70- 40(none). Cracking the small hard nutlet did not stimulate germination. Opening the nutlets showed that over 90% were either entirely empty or had a tiny undersized endosperm. It is possible that germination was nearly 100% in the viable seeds. Seed Germination Theory and Practice, 2nd ed., Ch. 20, Acer p. 83. 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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