Help Raising CannaTerra PH

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I use Canna pro as well. With Canna nutes. I have never checked the soil PH never. I spend a fair bit of time getting the water PH to maintain PH 6.5 - 6.8. Then add the Cana nutes then water the plants. 50 litre pots outside sees them through the season with no root bound probs, just plants not reaching their proper potential size. Better than feeding termites where I live. I'm also using fabric 19 litre (7 gallon) pots out doors and the plants are doing better in them that the 50 litre pots. Height is the same atm bushiness is about equal, for the size of the bags I am impressed.

 

Personally I would not be worrying about soil PH. Canna is a very good medium. Just keep your water PH where you are happy with the result. Everybody has gone through bad grows at the start, that is the learning curve. From your pic I believe you are doing a good job. If it works don't fix it.