Bell Pepper plants look terrible

My bell pepper plants look awful. They did look good very early and now lots of the leaves are turning yellow and that first pepper that I saw a few weeks ago has shrivelled up. The only thing I can think of is too much water. There is a horizontal line in my garden that seems to accumulate too much water and the peppers are in that line.
The tomato plants at the top of the upgrade or downgrade are as big as can be, over 6 feet, while the tomoto plants in the same row as the peppers look much smaller, even though they were planted later and they are plum tomatoes instead of the Beefsteaks or big Boys up on top.
I think I definately have a water problem retention problem, as there is sand in the soil. What do you think. From very hot and wet Long Island.
alan
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Your diagnosis sounds about right. If the year hadn't been as wet it has, then the ones in the swail would be bigger that the ones planted on higher ground.
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Ours are horrible as well. They're barely any bigger than when we planted them, but the peppers are huge, with very thin walls. Because the plants are so tiny, the peppers lie on the ground and basically rot on one side.
Strangely, our lettuce is delicious and not bitter at all...and we didn't use any shading. Weird! It's been 95 degrees every day for a month, with almost no rain (I water every day).
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