THC content has the most to do with genetics. You're plants look very healthy and well cared for. Your plants will express the maximum about of THC that their genetics will allow.
There is nothing you can do to increase the THC. It's all in the genetics And how it's grown. Give her a happy healthy life and she'll put out as much as she can genetically
Should i flush these last two weeks im using dry fert. Mixed in with a blend of my own mixed with happy frog 50/50
Bone meal blood meal and some bio~tone starter plus....in my large pot the others are jus happy frog and perlte
If by "flushing" you mean watering with just plain water for the last 2-3 weeks, then yes, I would do that. There are plenty of nutrients stored within the leaves that the plant will utilize in it's last days of growing. "Fade" is normal towards the end of canna's life cycle. No need to worry about yellowing leaves just before harvest. Big Bloom? Is that a chemical fertilizer?
Zero. I utilize sub-irrigated planters with a water only soil. I apply water from the top only to keep the first several inches of soil from getting too dry. 10 & 7.5 gallon pots... Watering to runoff is something that chemical growers do, only to help flush out excessive amounts of soluble nutrients present in the soil due to over fertilization. The same goes for "flushing". Somewhat counter productive, don't you think?
Chopped first one yield low but pot size was small. Nice potentcy for a swag blueberry hybreed i make