Again, yes, but read below:
http://www.clarinex.com/application..._display&event_input=treepollens&category=any
Tree Pollens
The Real Troublemakers: Hardwood Deciduous Trees
The real troublemakers are hardwood deciduous trees - oak, elm, birch, maple, ash, alder, and hazel.
These trees generally pollinate from February to April or May. In the South, these trees begin pollinating as early as January; in the North, they begin in April.
Oaks, found everywhere in the United States except Alaska and Hawaii, generally pollinate in February and March in the South and April and May in the Northeast. They tend to bloom one after another, prolonging the period of pollen exposure.
Birch trees, found in the eastern states, often trigger allergies in April and May. In the Northeast, Canada, and Alaska, gray and white birches are common; in the Appalachians and upper Midwest, yellow and sweet birches predominate; and in the Southeast, river birches bloom from March to mid-April.
Alders, found in the eastern United States and Pacific Northwest, produce pollen from February through April, causing allergic reactions in many people.
Elms can also cause problems for allergy sufferers. The American elm, widespread through the East and Midwest, blooms early in February in the South and in March and April in the North. The rock elm, found from the Midwest to the Northeast, blooms in the spring. In the South, the winged elm blooms in the spring and the September elm and cedar elm bloom in the fall.
Cross-Reactive Trees
Junipers, cedars, cypresses, and sequoias are "cross-reactive," meaning if you're allergic to one of these types of trees, you may be allergic to another. In Texas, the abundant mountain cedar causes problems for allergy sufferers. In the far South, junipers bloom in January; the Bermuda juniper blooms in March and April; in western Texas, Arizona, and parts of California, the Pinchot juniper blooms from September through November. Box elders are the only members of the maple family known to cause allergy problems. Commonly found in the Midwest, these trees bloom in January and February in the South and in April and May in the Northeast and Midwest.
Other tree allergens
Sycamores, found throughout the eastern states, also can cause allergic reactions. They are often used as ornamental trees in cities. A western sycamore, found in California and Arizona, blooms 2-3 weeks in April or May. Sweet fern, bayberry, Australian pine, olive, paper mulberry, hedge plant, hackleberry, sugarberry, hornbeam, hop-hornbeam, hazel, pecan, walnut, hickory, sweetgum, witch hazel, mesquite, acacia can also cause reaction.
Non-Allergens
The highly visible yellow pollen from pine trees - including spruce, fir, hemlock, larch, and the true cedars - rarely triggers allergies. Although pine trees generate clouds of pollen, they do not usually trigger your sneezing and runny nose.
Likewise, fruit-bearing trees, which depend on insects for pollination, almost never create an allergic response. These pollens tend to be heavy, sticky, and less numerous. Willows and poplars are also seldom the cause of allergy symptoms. Many ornamental poplars produce no pollen, making them ideal for people who suffer from allergies.
It seems mesquite trees are also a problem. Meats smoked with mesquite, hickory and pecan sometimes will cause me so allergic grief.
