There's a saying in the greenhouse industry that the customer loves their plants to death! I've been reading many blogs, websites, strain reviews, grow journals, youtube videos, Jorge Cervantes, Mr. Green, etc. Wow, I am intrigued by the level of detail paid to everything when growing canna. Before I discovered this whole Internet world of growing and discussion, I grew out nine plants. I used 1 part each of peat moss, finished, organically made compost which was inoculated with mycorrhizae (ENDO/ECTO even though pot doesn't use both) and decomposed granite sand. These plants never got taller than 16 inches and I harvested half pound. I forgot to mention that when I prepped the soil for containers grown outdoors in summer, I added in a large handful of Medina Soil Food which is their pelletized certified organic fertilizer. You can add dry molasses if you want, but the compost levels off the pH and iron, along with other nutrients are more available. That is not too terribly complicated. All I did was water the plants and if I saw a deficiency, I addressed it. I had no deficiencies.