yeah m8 id say 2.5 ml would be a better start and see how it goes you should every other water but if it tell you to use every water then try it, if you get a bad reaction then just flush the soil with water m8, 3x the ltr pot of water. I wouldn't be surprised if it got to 4ft tall my white widow bigbud was a bit shorter than that and it grew loads through the flower stage. Are you using molasses with you feed or anything else in conjunction with your flower nute...
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