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What causes bottom leaves to yellow and shrivel up?

I’m in week 4 of flower and everything has been going very well. I had to travel for work for 3 days, and when I came home the bottom leaves were yellowing/browning and shriveling up and falling off. The top half leaves are still green and perfect. What would cause this?
January 12, 2018 at 07:18PM

How to fix your marijuana plant problem .. read this fix

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