I planted these cucumbers last week, and yesterday I noticed the leaves have yellow spots and edges. Do I need to buy new plants?
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That looks like the result of poor hardening off. But the scorched leaf edges in your picture don't look too bad. The plants should be fine, that damage is mostly cosmetic. Next time, let the plant's adjust more gradually.
P.S. Those hills are very close, so close that even one plant per hill could get tight. Make sure you thin properly.