Cucmbers Help!!!!

First time grower....
I planted cucumbers from seed, they looked well. Decided to wait on 3-4 true leave showing before transferring on to bigger pots. At this point they were still looked well, hardened them off, popped the in the greenhouse. Now I have noticed the bottom leaves have started to fade in colour and crisp up at the edges, is this something to worry about? If so, what should I do??
Flowers, had several which have bloomed, then wilted, should I pick them off or leave them attached to the plants?
Also, what should I feed my cucumbers?
I’d be grateful any advice or tips, not sure what I’m doing really.
Thanks
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Has it been very cold at night where you are? Could the plant have been nipped by some frost?