If you're allergic to tree pollen, avoid:

Almonds, apples, carrots, cherries, hazelnuts, peaches, pears, plums.

If you're allergic to grass, avoid:

Melons, oranges, tomatoes.

If you're allergic to any seasonal allergies, avoid:

Beer, liquor, wine ( all three contain a histamine)

These foods have similar antigen responses in our body to those as the specific allergens like ragweed, tree pollen or grass. For example, chamomile and echinacea are close cousins to ragweed, so by consuming these things we can exasperate allergies. It is better to build up your body to prevent allergies in the first place so you can still enjoy these yummy foods and the outdoors, but avoiding triggers definitely helps!