Current grow is 5 autos ranging from 4weeks to 5plus weeks 4 are in canna terra professional potting mix. plant front right is in coco/perlite the canna plants have had 3 feeds starting at week 3 using canna vega little cal/mag due to very soft tap water. ec mix is usualy 0.3 calmag 0.6 vega 0.3 flores 1.2 ec total and this strenghth will most likely cause a bit of tip burn/ discolouration, but isn't really an issue. The canna terra is tricky to use with autos sometimes as when to add nutes. sometimes they can handle at 2 weeks some can go as long as 4 weeks but then its a juggle of how much grow to bloom? I usualy keep a good amount of nitrogen going in through the stretch preflower stage.