1．Some flowers smell too thick, it will make people uncomfortable, even adverse reactions, such as Cestrum Nocurnum, tulips, and so on-colored. 
    2．Some flowers, it will make people allergic reaction. Like Rose, jade cloves,colored Mei, geraniums, bauhinia, who patted them, tend to cause skin allergies, even rash, severe twinge.
    3．Some ornamental plants with toxic, attention should be placed, such as the Mimosa and Poinsettia, Oleander, yellow azaleas and red champion.