In general, if you replace wind-pollinated plants with plants pollinated by insects, you can greatly decrease the harmful allergens in your garden. You may have to forgo a favorite flower or two, but you'll still have lots of options. For example, replace geraniums with fuchsia, or chrysanthemums with Japanese anemone. Consider rosemary instead of lavender. No garden will be totally allergen-free, but making smart decisions about when you work in your garden also helps to reduce attacks.
Pollen counts are at their highest during early-morning hours and at dusk.
Grasses, Birch Trees, Garden Mums and many members of the Daisy family, Cosmos, Sunflower, Zinnia, Marigold, Asters, Carnations, Lavender, Primrose, Spider Flower, Foxglove, and Lantana.