There is no definitive answer to this question as it will vary depending on a number of factors, including the type of soil, the weather and the plants that are growing in the garden bed. However, as a general rule of thumb, it is recommended that you water your raised garden bed around once a week. This will ensure that the plants have enough moisture to thrive without causing the soil to become waterlogged. If you live in an area with hot, dry weather, then you may need to water more frequently. Conversely, if you live in an area with cooler temperatures and higher rainfall levels, then you may be able to get away with watering less often. Ultimately, it is important to keep an eye on your plants and see how they are looking – if they seem like they are starting to wilt or look dried out, then give them a good soak.