Terra Canna Professional, how often do you fertilize

I've used it previously, it's a good medium, just be aware it's classes as a soilless potting mix and should be watered at pH 5.8-6.
I used ferts with every watering, just make sure you water to run off.
I also found you have to water really really slowly when it's dry, the medium gets hydrophobic and the water will try to run straight through.
 
Ah I’m in USA you are across the ocean somewhere - maybe Australia?
In the UK, Canna terra is probably the most commonly sold grow medium over here, it's a mission trying to find anything else at times,
 
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