Answer: Sometimes new plants are a bit slower to emerge in the spring, I suspect because their root reserves are not quite as substantial as the more established plants. Also, a wetter location will tend to have colder soil later in the spring than a better drained one, especially if it is in a low spot that acts as a frost pocket, so the soil may still be relatively cold there thus slowing them down. (Microclimate can have a lot to do with how plants perform.) I think I would still be patient a little longer. You could gingerly dig down (there is a risk you could damage the emerging growth below ground) and see how they are, in case for some reason they rotted away during the winter -- although I would bet they are just a little slower than the others. Good luck!
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