When flowers planted near each other require vastly different growing conditions, both could end up suffering because you can’t meet each of their needs. “A lot of new gardeners choose plants for how they look and don’t pay attention to the tags,” says Melinda Myers, gardening expert, author, and host of the How to Grow Anything DVD series. One example of this: The butterfly weed loves the sun and dry soil, while impatiens craves moisture. Don't fall into this trap. Avoid grouping together plants that have opposite wants.