Lock leaf particles rotation to specific axis?

My goal is to make a weeping willow tree, so I’m using a particle system for the leaves, which are long strands hanging towards the ground. I want to make it so the rotation in the z axis is random with little to no rotation on the x and y axis, so they always appear to be hanging. How can I achieve this? My settings and results are shown below.

Thanks.

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I solved this by rotating the object itself and changing the orientation on the right to object Z.

Here you can see the large leaf at the bottom turned on it’s side, and the tree looking roughly natural with each strand dangling towards the ground and rotating randomly.

I probably could’ve done this with any axis if the object itself was rotated correctly.

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