Can't find how to animate hair particles growing. For some reason keyframes don't work on the hair length parameter.
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Set the length to the longest you want the hair to be, and then keyframe the End factor in Particles > Render > Timing:
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1$\begingroup$ How can you do that when using a group configuration? I want to grow leaves and trees. but the end parameter disapears when using group or object. $\endgroup$ – Jamingrone May 30 '18 at 4:03
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1$\begingroup$ @Jamingrone Sounds like a good candidate for a new question :) We try and keep to one question per post to keep things organized. $\endgroup$ – gandalf3♦ May 30 '18 at 6:56