I live in El Paso, Texas and last year I had an infestation of whiteflies on my (15) potted geraniums. It was so bad that most of them died. My question is, do I get rid of last year's soil? Do I buy new soil? And what is the best prevention for whiteflies?
Certified GKH Gardening Expert
I would either get rid of the soil or sterilize it by literally cooking it in your oven at 400 F for 30-45 minutes. This will kill any pests and pathogens in the soil.
Here is more information on controlling whitefly: