That's some really healthy looking roots. I think you should be getting flowers even if they don't set.
Is this the first time you are doing DWC outside? I always considered it on a small basis but how do you handle the rain?
How hot does the water get? I would put those windshield sun shields around the buckets to keep the water temperature down.
We're coming to the end of fruit set because our night time lows are reaching > 72.
What are your daytime highs / night time lows?
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