The recommended combination of Dutch Formula 1, 2 and 3 during the 18 hour vegetative stage is the best guarantee for high quality results and strong, healthy plants with lush green leaves. Dutch Formula GROW creates the ultimate conditions for crop production during the next stage. You should stop the application of GROWbetween 21 and 30 days after your plants have entered the twelve hour flower phase.
Some leaves turn brown as in the photo. Leaves in the middle turn brown first, then bottom leaves. Now I try making larger lamp-to-plant distance and feeding less nutrients, but no good sign appears. Other conditions are stated in my diary. Why do you think it is? 
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