my lemon cucumbers sprouts are dying
 

Hi All,

I am trying to grow lemon cucumbers this year. I got a bunch
of beautiful sprouts pop up.

But, the two large leaves on the sprouts have started to get
light brown patches, like circles. Eventually the whole
leaf turns brown and falls off leaving me a stem. Eventually
the stem dies too.

Too much water? Too little water? Too cold? I am baffled.

-T