I had to wait to flower too... I waited 2 more weeks plant grew 4-5 more inches but if you excuse the photos here are the results I saw using Canna's Rhizotonic
I germinated in 1" rockwool and placed seedling in the net pot lid 5-6" net cup full of hydrotrons. The roots grew all in the rocks and you can see in the first photo they did not look good to me especially for a 4 week old plant.
Think of the roots like your arm, this product grows the hairs, it works and does not raise your PPM! I use 30-40ML maybe raises it by 15 at the most!!!
Day 1 of Rhizotonic
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Day 6
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Day 10
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Day 14
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Late into flower Rhizotonic is only used during Veg
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Here is what the product looks like
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