Suffer from allergies every year? Here is a partial list of the trees that you might not WANT to plant! Of the 50,000 different kinds of trees, less than 100 have been shown to cause allergies. Most allergies are specific to one type of tree or to the male cultivar of certain trees, such as:
* Catalpa
* Elm
* Hickory
* Olive
* Pecan
* Sycamore
* Walnut.
The female version of these species are totally pollen-free:
* Ash
* Box elder
* Cottonwood
* Date palm
* Maple (red)
* Maple (silver)
* Phoenix palm
* Poplar
* Willow
