Leaves curling up?

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Well, let me say that me and a friend have been reading anything and pretty much everything about the leaves curling up for the past few days. He doesn't have the net so hes pretty much here for all his probs. Fact is, he still doesnt know what to do and will not stop looking until he does so I'm trying to end my heart ache with this thread.

3 plants in gallon size pot each, outside, about 4 weeks old. They recieve direct sunlight all day except for an hour or 2 in the late afternoon. Brand new soil was used so I don't think its a deficiency like we've been been reading. No fertilizers have been added. Soil has been kept wet all the time. The weather has been up and down with temps low some days and high others, cloudy n rainy some days bright n sunny others u get the picture.

Plant leaves are curling upward and they arent looking as lively as they used too, still green though. It seems to have been lookin a little poorer every day for the last 5 days or so.

Anyways, I was thinkin maybe someone could help. I was thinkin maybe he needs to let the soil dry up some n that could be the prob since hes kept it moist day in day out for the past 4 weeks. Or maybe the recent hot days after colder rainy days could have caused this. Any feedback is appreciated.

Have him check the ph...