I reuse all of my soil. You can mix it with fresh soil.

Thanks for the reply, Zackey. No worries about tomato diseases?

Thanks for the reply, Zackey. No worries about tomato diseases?

I NEVER throw soil away. If there was a disease in the pot or raised bed,I make certain the soil gos into a special compost bin that will not be used for 2 or more years. In the ground,I rotate crops. My thinking is that most disease can only survive in host plant material. The extra time in a bin assures total composting. I don't hold hard and fast to rotation but try to as best I can. That is to say I don't plant the same thing in a spot,be it pot,raised bed or in the ground. Not only does that help with disease prevention,nutrients are alowed to stabilize as well.

Is that actually soil or is it a soilless potting mix?
If actually garden soil you can simply put it back where it came from. If it is a soilless potting mix you could out it into the garden as a soil amendment or mulch or you could compost it.