japanese maple shrinkage

i have a couple of unshaped [u:f8d2066bb2]japanese maples[/u:f8d2066bb2], and it looks like the trunks are "losing weight," like they are not as "fat" or filled in as say a month or two ago. not that i calipered them or anything, but they just look kinda hungry. is this just normal going into fall/winter, or am i watching too many slimfast commercials?

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TreeBay

Hi John,

A taller tree tends to look thinner. *Maybe your trees are just growing up and losing their stubby appearance?

Another possibility is that there is a graft somewhere and the trunk is growing at a different rate above and below the graft, giving a necked down appearance?

Trees continue to grow by putting on more wood as long as they are alive. *So I can't imagine that this appearance is anything more than a perception.

[i:dbf053c853]bonsaiTRIVIA fact: *While alive, the density of the wood in different trees species, from balsa to oak, is surprisingly similar because a substantial proportion of that weight is made up of water held in the tissues. *When the wood is cut and dried, the actual density of wood fiber becomes the more significant factor.[/i:dbf053c853]

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Soildoc

Gee, I wish I had this problem. I think as I get older my "trunk" tends to expand instead of shrink.