Close-up of Giant Ragweed flowers (Ambrosia trifida)
Most cases of hay fever are caused by allergies to ragweed. Here’s what to know about ragweed, and how to avoid it.
Close-up of Giant Ragweed flowers (Ambrosia trifida)
Most cases of hay fever are caused by allergies to ragweed. Here’s what to know about ragweed, and how to avoid it.
