Carolyn, when I was young my Mom kept them in a glass of water all the time and she never had any bugs. I think the water keeps them away. I am not sure but I think that is how it works.
I have over 100 plants in the house in the winter and I never have a bug problem. I do not know why but I do not bring my houseplants inside until after we have a frost. Since there is not soil I assume there will not be bugs since they are growing in water.
