I'm no expert but I have planted tomatoes, peppers, and eggplant. The eggplant I've only had for a couple weeks, so can't say a lot about that. The tomatoes and peppers though have all bee started from seed mostly, and at exactly the same time, so I can comment on those. I have all of mine in the same very sunny location. My tomato plants are growing like mad and the peppers are much slower. I don't think peppers get anywhere near as big as tomatoes if you're just growing them for one season (they just keep growing in the right climate). It's funny though because I can see a HUGE difference between the rate of growth from one pepper plant to the next, not sure why. They all have the same type of soil, same amount of water and sun. A couple are definately growing much faster than the others though.