sentence: other latex metal wood plant pollen ( hay fever ) grass -- ryegrass , timothy-grass weed -- ragweed , plantago , nettle , artemisia vulgaris , chenopodium album , sorrel tree -- birch , alder , hazel , hornbeam , aesculus , willow , poplar , platanus , tilia , olea , ashe juniper , alstonia scholaris seasonal allergies seasonal allergy symptoms are commonly experienced part of the year , usually during spring , summer or fall when certain trees or grasses pollinate .