At what point in the plants life should you start introducing nutrients
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Depends on soil, but usually when they start flowering you start with nutes. If you have a blank substrate, like coco or peat…not living, not organic, then after seedlings have 2nd, 3rd node.If you have living and organic soil mixed…sometimes not until later flower. The trick is to learn to let your plants tell you when they need feeding
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When they tell you they are hungry. 
For example, if they are looking a little skinny or a little peaked.
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Thanks dude you have been a great help and source for information
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