I've been an avid organic garden over the last few years, I recently switched up my garden to incorporate granular organic based fertilizers, some integrated with salts, some purely organic. The fertilizers that have salts integrated to them have performed the best, which set off the light in the ole dome of mine.
Being naive in the beginning I bought into the marketing schemes of canna specific fertilizers, well after burning the fuck out of out of my plants I switched to all organic amended soils and found out quickly that the plants would start to starve mid to late flower. Don't get me wrong I pulled off some nice grows using only organic amendments, looking back now I’m sure the plans didn't grow to their full potential, I was happy with the final product, but I bet the final product would have been that much better by maintaining proper plant health.
A few months back I discovered Fox Fax Marine Cruise (10-7-7) and it works pretty good, during the vegetative stage the plants thrive and the roots are monstrous compared to the plants that were veg’d with organically amended soil.
I've noticed that once the plants quit stretching they almost immediately run out of (N), I would try to green them back up with high (N) guano teas and what not but the plants never seemed to recover from the (N) deficiency, after reading the first few pages of this thread I quickly realized I should have been using salts to correct the deficiency all along.