Overwatering may be a problem with plants that are normally drought-tolerant, as many of our natives are.
On maintaining native plants: I am the first to tell you that my design skills are suspect, but incorporating a native into a plant design is no more difficult than incorporating any other plant. Their maintenance, however, is a different topic. Many of our natives have evolved large taproots for survival or small leaves to conserve water. Overwatering may be a problem with plants that are normally drought-tolerant, as many of our natives are. Realistically, many of our plants need tough love to look good in a garden setting. They do not want or need great handfuls of fertilizer, and they benefit from vigorous pruning when they begin to look weedy. And in the case of meadow gardens, talk with your gardening buddies and look into the benefits of burning. Of course, you might want to notify the local fire department as well.