So many of us use herbs and vegetables from our gardens for regular daily cooking. It's much more practical to plant those species close together for quick picking. When you're tossing up a fresh tomato salad, it's so handy to have the tomatoes, green onions and basil planted close together. All you have to do is pick, throw in a bowl, add some olive oil and your salad is ready to go. The only thing you have to be concerned with, is that all those plants grow under the same relative conditions.