ibraash, there are many varieties of potatoes that don't flower so don't let that worry you. I have never grown in the tall wooden towers so I can't help you there. I grow in very large Rubbermaid totes
Potatoes do like the sun . So maybe that is why they yellowed, and they need adequate water too Did you feed them anything at some point..
Also I don't know your weather which may be a decisive factor in their harvest times. I usually wait till the foliage dies down except when I want a few babies from the earlies and I feel down to see what is there..this is firkling.
XX Jeannine
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