Wäre es aber so einfach wie Franklinia sagt .....
Ich habe es verschiedenen Malen versucht aber das Ergebnis war entmutigend. Letzte Mal habe ich etwa 100 Zamen ausgesät und nach 2 Jahren keimten nur 2. Sonst niente, nada, noppes.
Was schreibt Norman Deno (Seed Germination: Theory and Practice) über Acer griseum? Das folgende:
"A. griseum has a hard impervious seed coat. The seeds germ. 70(25% in 2nd
w) and 40(30% in 4-9 w)-70(15% in 2nd w) if the seed coats are removed at the start
and 40-70(50% in 2nd w)-40-70(30% in 2nd w) if the seed coats were removed after
the first 3 m at 40. It is likely that the that the higher percent germination in this latter
treatment was because the seed coats were easier to remove without mechancial
injury after the 3 rn moist at 40. The 60% of empty shells were not counted."
Source: Deno, Seed Germination, p. 90
NB: Temperaturen in Fahrenheit (70 F = 20 Grad Celsius)
40-70 = Zyklus von 3 Monaten 5 Grad C danach 3 Monaten 20 Grad C
So es scheint wichtig zu sein die Hülle der Samen zu entfernen. Aber das ist, wie Deno sagt, schwierig zu machen ohne die Samenkern zu beschädigen. Und er sagt auch das ein ziemliches Prozentsatz (60%) von seine Acer griseum Samen leer war. Dies scheint mir wichtig zu sein da es bestätigt das Acer griseum eine niedrige naturliche Fruchtbarkeit hat. Wen man Samen kauft von Acer griseum is es gut dies zu wissen.
Aber ich habe weiter überprüft auf das Internet. Auf die Site von Twining Vine Gardens fand ich die folgende Hinweis:
"Acer griseum: absolutely no doubt I suffered green eyed envy when first spotting my first plug tray of seed grown Acer griseum. Hailed as one of the most difficult of Acer to germinate, I took on the challenge and over the years of trial, failure, blended with tantilizing brief bouts of success, I think after three years, EUREKA!!! Until I repeat the experiment to confirm, what I discovered was after two bags were accidentally left in the greenhouse over the summer they became bone dry. I pulled them out and not wanting to dump the mess, I hit them with a little water and promptly left them on the overwintering bench. Right about the first week of January, I looked in the bags to discover that seeds were cracking open. Now here its Feb 21st and there's growing pots filled with little seedlings. What is weird is that both bags were cold stratified since collection...one was 5 years old and the other is of unknown age as the ink on the bag had rubbed off. These didn't sprout during warm nor cold stratification and only started to sprout en masse after being bone dry in the greenhouse after prolonged moist stratification. It will be interesting if this happens with fresh seed. Update: having a bone dry cycle during summer seems to be the ticket judging from the bagged seed I uncerimoniously dumped on the shelf outside the greenhouse in full shade. Checked (April 16th) and there are healthy sprouts emerging.
Source:
http://www.plantexplorers.com/twiningvine/article_info.php/articles_id/38Sollte man die Samen wirklich austrocken lassen nach dem Stratifizierung? Ich weiss es nicht. Der Skeptiker in mir sagt das ist falsch weil die Samen der meisten Acer Sorten austrocknen nicht sehr gut ertragen. Aber vielleicht ist Acer griseum die Ausnahme. Wenn man ausreichend Samen hat ist es sicher ein Versuch wert.