This maple from Japan is rarely seen even in collections. From mountain forests of Honshu, Shikoku and Kyushu, I have seen only the one tree several years ago in Osaka University botanic garden but didn't get a picture. I recently obtained some seed (late October). After 2 weeks of artificial cooling, I grew impatient and rather than wait 12 months till our next spring, I have successfully sped the germination process up by exposing the young root and planting in a sealed pot. Growth seemed slow at first and some plants had their growth tips eaten by a caterpillar, but all have now recovered except 1 of the ones that germinated. 2 plants did not germinate, both were soft when I attempted to extract the embryo and were clearly not viable. The pictures show the initial preparation and at 4 weeks.