Yes you can but you may notice deficiencies. I use the same, Canna Coco and canna coco nutrients, its not really expensive if your growing weed its not even a drop in the ocean. Use just A+B and cut out the boost and rhizo and cannazym every other water if you want to save cash. My mate never uses boost, just A+B and he has good results too.I just did my first grow on Canna and it went great. I'm using Coco. Can I water one day just ph water and the next nutrients? Feeding daily is getting very expensive as I expand my grow