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I am trying to make grass using hair particles. When I add hills to my scene the grass/hair lays flat - I need them to stay vertical.

Here's a picture and my .blend file. What's going on? I have looked everywhere for an answer over the past 3 days. Hair laying flat.

blend file

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In the particle panel, click on advanced, then in the velocity section, lower the normal strength and grow the Z strength :

enter image description here

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