Ours is to grass and trees so March - July but due to other allergies we take antihestamine daily. I have found there is a science to it, like when to air the room and not to, certain days that are worse, etc. And before we split the dose in two, but now give all in one go before his worst times, so am for us. However, asthma doctor suspected food allergy when I told him of constant runny nose in winter and he tested him. Turned out it was allergy to egg, chickpeas and some other stuff, on top of the dairy Nd soy we excluded earlier. So the doctor was pretty astute, as we already exlcuded some of DS's worst offenders but continued to have the nose and rashes. Now after excluding more he seems much better.
