susan searles

I have always treated spider mites with a little castile soap in water. Spray every 3 days to disrupt the cycle. I have never heard of mites being in the soil and I wouldn't repot. Just use the soap for a couple of weeks. We used to put plants on Pebble trays to keep the humidity up around them and that will retard spider mites. It does seem like once a plant has spider mites badly, it is always something that you will have to watch for. Just put the plant in the bathtub or outside and spray it down regularly.