Northern Lights Auto ProfessorAutoflower

So I left this plant for 7 days while on vacation. I used an automatic watering system. His plant got only a quarter of a gallon of water per day with no nutes. Came back and the the plant was lacking Nitrogen and showing fall colors much more. I watered and gave a good amount of nutes. I checked the trichomes today and I see some amber so I plan on starting to flush this plant tomorrow. I will harvest in a week or two.