Can I put tomato plants and pepper plants in the same pot?

I can’t see why not. We do, at my house, in things called Earth Boxes.

Yes, but remember they need sun. And you can try the basil again in the same pot. Then all you need is a mozarella tree for a pickable snack. I am now trying to grow tomato plants inside from the seeds of a tomato I had for lunch. This is to get a jump on the growing season.

Yes mine are growing in my garden next to each other. I also know they can grow in containers just make sure they get enough sun and water. I also fertilize mine to increase pruduction and size of the fruit. My favorite fertilizer is aged rabbit poop.

yes. Ensure adequate drainage. They’ll take roughly the same amounts of water.

You need a large pot!

There is a potential disease issue. Tomatoes and Peppers are closely related and subject to the same diseases and soil problems. As long as your plants are healthy, they should be fine, but you will want to ensure adequate nutrient content. If one or the other is harboring a disease or fungus, however, it can transfer to the other.