Garden beds are generally designed to soak up more water than the remaining parts of the property, so this will always be a concern. If the mulch is at the same level as the yard, excess water will run off as the landscaper suggest; however, you do have to watch the water flow patterns in your yard. If the bed is holding too much water can be determined visually by looking for water standing in the bed a day after the rain, or by a moisture meter. If the moisture is not overly wet, then the plants will be making use of it (an annual flower bed would use more than the grass for example). If you do have too much moisture, then you do have to look at ways of encouraging draining.
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