how do I add displacement to an L-System tree?

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Hi,

I'm trying to add a displacement map to a L-System tree and want to have less to no displacement towards the ends of the branches. Otherwise, it distorts the branches in a funny way. Does anyone have any suggestions on how to properly do this? Is there a way to have the displacement get gradually less as it moves up the tree? I mainly need the displacement of the tree's trunk.

Thanks for your help,
Nick
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