Before that happened, it became very obvious that the tree was not 'Aconitifolium' at all but 'Green Cascade' - very similar in foliage attributes to Aconitifolium but with a very pronounced weeping habit. Long story short, the tree 10 years or so later is 3' tall and about 6' across. However, since it was a very low graft and with the confusion on the labeling, never staked to develop a more upright habit. Consequently it remained in a raised container, as the branches extended well below the height of the trunk. Lots of lateral growth as opposed to upright growth :-)

Not sure what you can get out of this tale except to say that when young, these trees will grow at a much faster rate than they will as they age. 'Aconitifolium' can be considered to have a moderate growth rate in our climate - I'd expect it to reach 10' in as many years and ultimately older specimens can reach 20-25' easily.

Because of their delicate, lacy leaf form and drop-dead gorgeous fall color, both remain two of my favorites of any of the Asian maples. And with significant cold hardiness to boot.