You can be allergic to basicly anything, so it does happen with other types of plants. An allergy is your immune system (wrongly) thinking that thing is dangerous, I have to fight it. Why you specificly are just allergic to grass and not other plants because your immune system identfied grass as something dangerous and doesnt think other types of plants are. As to why your immune system would think its dangerous we dont know yet, that is an active field of reasearch.
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