vfem
Garden Addicted
I personally have not seen any issues with mosquitos in them... but like a bird bath, you need to change and move the water. I found this idea in a book about native bird and butterfly gardens. It suggests even using a birdbath with the rock.... generally that is what butterflies and dragonflies want... something wet and rocky to land on so they can drink without drowning. Just be careful to take care of the water and not let old water sit or weeks without changing it.