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Following negative exponential growth towards the top makes some sense. You want to have more weight towards the bottom/middle for balance. Interesting that the bulk is in the middle of the stalk.

edit: Maybe I misunderstood? I'm a bit confused on width/length here.

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“Wall thickness” (not width) decreases from bottom to top, which fits your comment of more weight towards the bottom.

Internode length increases up to the middle node (not sure if it’s also middle height), then decreases from mid-node to top.

Then internodes at the top are shorter and lighter.

I don’t know if the length pattern has some evolutionary advantage.

The stalk wants to grow tall quickly (but not any taller than necessary, hence the successively increasing node distance in its “search”) until there is sufficient light, then it begins to disfavor further height growth in favor of increased density of leaves (nodes, where the leaves come from)

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