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About the plant What it is and where it grows — not part of any germination protocol.
The plant
Habit Tree Extension Gardener Plant Toolbox
Habit tree Plants of the World Online
Height 40-50 ft 12-15 m Extension Gardener Plant Toolbox
Spread 30-50 ft 9-15 m Extension Gardener Plant Toolbox
Flower Gold/Yellow, Green, Insignificant Extension Gardener Plant Toolbox
Blooms Spring Extension Gardener Plant Toolbox
Native range Afghanistan, Albania, Austria, Baltic States, Belarus, Belgium and elsewhere GBIF Backbone Taxonomy
Hardiness zones 3-7 Extension Gardener Plant Toolbox Growing conditions
Sun Full sun; Partial Shade Extension Gardener Plant Toolbox
Soil Clay, Loam (Silt), Shallow Rocky Extension Gardener Plant Toolbox
Soil pH 4.8-7.2 PLANTS Database
Moisture Good Drainage, Moist, Occasionally Dry Extension Gardener Plant Toolbox
Watering Drought tolerance: Low PLANTS Database Toxicity is noted only where a source states it. No note here is not a finding of safety.
Sources: Extension Gardener Plant Toolbox — NC State Extension; Plants of the World Online — Royal Botanic Gardens, Kew; GBIF Backbone Taxonomy — Global Biodiversity Information Facility; PLANTS Database — USDA NRCS.
Worth knowing Introduced to North America in the mid-1700s as a shade tree, it is now invasive there, and its sale is banned in New Hampshire, New Jersey and Massachusetts. Wikipedia: Acer platanoides Told from the sugar maple by the sap in its leaf stalks: white and milky in Norway maple, clear in sugar maple. Wikipedia: Acer platanoides This source reports three treatments. All are shown.
Protocol 1 N. C. Deno, 1993 Difficulty Low Rated by us, not by the source.
1 Sow outdoors and leave it
No stated waiting before sowing.
93% germination.
This source doesn't state how long step 1 lasts.
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. platanoides germ. at 40, and fresh seeds should be sown immediately at either 40 or outdoors as exposure to moist conditions at 70 is deleterious. Fresh seed germ. 40(41% in 12th w)-70(23% in 2-3 d), 70-40(13% in 10-12 w)-70(4% on 2nd d), and 93% in outdoor treatment with germination taking place in late winter and early spring. Germination would have been greater at 40 if the time at 40 had been extended beyond 3 m. Opening the seed coats has no effect. Seeds collected in December gave the same results as seeds collected in October showing that some DS at 40 is tolerated. However, there is significant deterioration] of the seeds and hardening of the seed coats when DS for 6 m at 70. The. DS seeds germ. 38% in 4-7 w at 40 but only if the seed coats were removed. The seedlings were weak and did not survive. DS should be avoided. . 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. Protocol 2 N. C. Deno, 1993 Difficulty Moderate Rated by us, not by the source.
Start around January 11, 2027 for a May 3 last frost.
1 Cold moist stratification
Duration: 90 days · Temperature: 40°F 4°C
2 Warm moist stratification
Duration: 90 days · Temperature: 70°F 21°C
23 germinated in this phase.
Steps after step 1 run on after germination.
Germination happens during step 1, in 84 days.
41% germination in 84 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. platanoides germ. at 40, and fresh seeds should be sown immediately at either 40 or outdoors as exposure to moist conditions at 70 is deleterious. Fresh seed germ. 40(41% in 12th w)-70(23% in 2-3 d), 70-40(13% in 10-12 w)-70(4% on 2nd d), and 93% in outdoor treatment with germination taking place in late winter and early spring. Germination would have been greater at 40 if the time at 40 had been extended beyond 3 m. Opening the seed coats has no effect. Seeds collected in December gave the same results as seeds collected in October showing that some DS at 40 is tolerated. However, there is significant deterioration] of the seeds and hardening of the seed coats when DS for 6 m at 70. The. DS seeds germ. 38% in 4-7 w at 40 but only if the seed coats were removed. The seedlings were weak and did not survive. DS should be avoided. . 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. Protocol 3 N. C. Deno, 1993 Difficulty High Rated by us, not by the source.
Start around October 14, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on October 13, 2026.
1 Warm moist stratification
Duration: 90 days · Temperature: 70°F 21°C
2 Cold moist stratification
Duration: 90 days · Temperature: 40°F 4°C
3 Warm moist stratification
Duration: 90 days · Temperature: 70°F 21°C
4 germinated in this phase.
Steps after step 2 run on after germination.
about 3 months from start to step 2. Germination happens during step 2, in 84 days.
13% germination in 70–84 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. platanoides germ. at 40, and fresh seeds should be sown immediately at either 40 or outdoors as exposure to moist conditions at 70 is deleterious. Fresh seed germ. 40(41% in 12th w)-70(23% in 2-3 d), 70-40(13% in 10-12 w)-70(4% on 2nd d), and 93% in outdoor treatment with germination taking place in late winter and early spring. Germination would have been greater at 40 if the time at 40 had been extended beyond 3 m. Opening the seed coats has no effect. Seeds collected in December gave the same results as seeds collected in October showing that some DS at 40 is tolerated. However, there is significant deterioration] of the seeds and hardening of the seed coats when DS for 6 m at 70. The. DS seeds germ. 38% in 4-7 w at 40 but only if the seed coats were removed. The seedlings were weak and did not survive. DS should be avoided. . 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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