Once 40% of your plant's trichomes turn amber/cloudy, proceed into Flush. 

During the Flush stage, your Grobo doesn't give your plant any food, forcing it to use up all of it's reserves. This makes for a very smooth final product. Try to flush your plant for at least 5 days of the 10 available in this stage.

Check out this article: What are my trichomes colors telling me?

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