I want to get another tree for my garden. I would love a Silver Birch but apparently it's really bad for hayfever/allergies. Another of my favourites is Rowan. Is it wind or insect pollinated? (aparently plants are ok for allergic people if they are insect pollinated) How about hazelnuts?
If it's wind pollianted, can you suggest something else that would be suitable? (not fruit, this is in addition to fruit trees!)