| You can spray it anytime you want leading up to seed day, and on seed day, but once your seeds germinate, you should NOT spray it again until the new gras has been mowed 2-4 times or 4 weeks whichever is longer. Weed seed germination occurs when soil reaches the correct temperature. Most blogs and forums will tell you that your plants are ready to veg after two weeks, but that s far from true; it usually takes about 3 4 weeks from germination for your seedling to use up all the energy stored in the seed, although some plants develop faster than others. Source: http://redz-gaming.com/forum/topic/14593/aladin138
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