latin i use mg on all my plants, check out my last years journal, to 1 gallon of water i use half of the tblsp of mg, thats the big side of the scooper that comes in the box, make sure you stir it up. the mg soil says it feeds plats up to 3 months or so, i would start feeding them small doses now.a lot of people dont like mg on weed because its cemi, but you cant argue with results.