For people with allergies, gardening can be a challenge, but if you know what to plant and when, you can have a sneeze-free garden. The first thing you have to do is figure out what you're allergic to. It might be certain flowers, grass, trees or shrubs, or it might be certain pollens. Only an allergist can tell you for certain. When picking out plants and flowers, stay away from those, like alyssum, that are fragrant; generally they stimulate a sneeze-fest. Some good sneeze-free plants include impatiens, hosta, astilbe, snow-on-the-mountain, scabiosa, columbine, viola and ajuga.